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Go Programming Language

Go — Complete Tutorial

Learn Go from absolute zero. Every topic explained simply with real examples you can edit and understand quickly.

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TutorialHomeIntroductionGet StartedSyntaxOutputCommentsVariablesConstantsData TypesOperatorsArraysSlicesStructMapsConditionsSwitchLoopsFunctions
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go-lab.go
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∙ Chapter 001

Go Tutorial

Learn Go Tutorial with a small example you can edit and run.

📝Syntax
go version
go run .
⚡Example (Edit & Run)

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tutorial.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
fmt.Println("Welcome to Go")Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Go is used for backend services, CLIs, and cloud tooling.
⚠Common Mistakes
  • 1Ignoring error handling and writing huge functions.
✅Best Practices
  • 1Keep functions small and handle errors explicitly.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Tutorial
∙ Chapter 002

Go Home

Learn Go Home with a small example you can edit and run.

📝Syntax
go version
go run .
⚡Example (Edit & Run)

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home.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
fmt.Println("Welcome to Go")Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Go is used for backend services, CLIs, and cloud tooling.
⚠Common Mistakes
  • 1Ignoring error handling and writing huge functions.
✅Best Practices
  • 1Keep functions small and handle errors explicitly.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Home
∙ Chapter 003

Go Introduction

Learn Go Introduction with a small example you can edit and run.

📝Syntax
go version
go run .
⚡Example (Edit & Run)

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introduction.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
fmt.Println("Welcome to Go")Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Go is used for backend services, CLIs, and cloud tooling.
⚠Common Mistakes
  • 1Ignoring error handling and writing huge functions.
✅Best Practices
  • 1Keep functions small and handle errors explicitly.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Introduction
∙ Chapter 004

Go Get Started

Learn Go Get Started with a small example you can edit and run.

📝Syntax
go version
go run .
⚡Example (Edit & Run)

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get-started.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
fmt.Println("Welcome to Go")Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Go is used for backend services, CLIs, and cloud tooling.
⚠Common Mistakes
  • 1Ignoring error handling and writing huge functions.
✅Best Practices
  • 1Keep functions small and handle errors explicitly.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Get Started
Go Basics
∙ Chapter 005

Go Syntax

Learn Go Syntax with a small example you can edit and run.

📝Syntax
package main

import "fmt"

func main() {
  fmt.Println("Hello")
}
⚡Example (Edit & Run)

Edit the Go code below and click Run. The output panel shows the extracted Expected Output notes (or simple prints).

syntax.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
score := 82Declares/initializes variables.
result := "Fail"Declares/initializes variables.
if score >= 75 {Conditional branch.
result = "Pass"Go line.
}Go line.
fmt.Println(result)Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Go is used for backend services, CLIs, and cloud tooling.
⚠Common Mistakes
  • 1Ignoring error handling and writing huge functions.
✅Best Practices
  • 1Keep functions small and handle errors explicitly.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Syntax
∙ Chapter 006

Go Output

Learn Go Output with a small example you can edit and run.

📝Syntax
fmt.Print("Hi")
fmt.Println(" Go")
fmt.Printf("n=%d\n", n)
⚡Example (Edit & Run)

Edit the Go code below and click Run. The output panel shows the extracted Expected Output notes (or simple prints).

output.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
fmt.Print("Hi")Outputs text using fmt.
fmt.Print(" ")Outputs text using fmt.
fmt.Println("Go")Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Go is used for backend services, CLIs, and cloud tooling.
⚠Common Mistakes
  • 1Ignoring error handling and writing huge functions.
✅Best Practices
  • 1Keep functions small and handle errors explicitly.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Output
∙ Chapter 007

Go Comments

Learn Go Comments with a small example you can edit and run.

📝Syntax
// single-line
/* multi-line */
⚡Example (Edit & Run)

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comments.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
/* multi-lineGo line.
comment */Go line.
fmt.Println("Comments don't change output")Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Go is used for backend services, CLIs, and cloud tooling.
⚠Common Mistakes
  • 1Ignoring error handling and writing huge functions.
✅Best Practices
  • 1Keep functions small and handle errors explicitly.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Comments
∙ Chapter 008

Go Variables

Learn Go Variables with a small example you can edit and run.

📝Syntax
var name string = "Mana"
age := 21
⚡Example (Edit & Run)

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variables.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
name := "Mana"Declares/initializes variables.
age := 21Declares/initializes variables.
age = age + 1Go line.
fmt.Printf("%s is %d years old\n", name, age)Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Go is used for backend services, CLIs, and cloud tooling.
⚠Common Mistakes
  • 1Ignoring error handling and writing huge functions.
✅Best Practices
  • 1Keep functions small and handle errors explicitly.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Variables
∙ Chapter 009

Go Constants

Learn Go Constants with a small example you can edit and run.

📝Syntax
const Pi = 3.14159
⚡Example (Edit & Run)

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constants.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
const Max = 100Declares a constant.
func main() {Program entry point.
fmt.Println(Max)Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Go is used for backend services, CLIs, and cloud tooling.
⚠Common Mistakes
  • 1Ignoring error handling and writing huge functions.
✅Best Practices
  • 1Keep functions small and handle errors explicitly.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Constants
∙ Chapter 010

Go Data Types

Learn Go Data Types with a small example you can edit and run.

📝Syntax
var a int = 7
var b float64 = 3.14
var ok bool = true
⚡Example (Edit & Run)

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data-types.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
var a int = 10Declares/initializes variables.
var b float64 = 3.5Declares/initializes variables.
var ok bool = trueDeclares/initializes variables.
var c rune = 'A'Declares/initializes variables.
fmt.Println(a)Outputs text using fmt.
fmt.Println(b)Outputs text using fmt.
fmt.Println(ok)Outputs text using fmt.
fmt.Println(string(c))Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Go is used for backend services, CLIs, and cloud tooling.
⚠Common Mistakes
  • 1Ignoring error handling and writing huge functions.
✅Best Practices
  • 1Keep functions small and handle errors explicitly.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Data Types
∙ Chapter 011

Go Operators

Learn Go Operators with a small example you can edit and run.

📝Syntax
sum := a + b
mod := a % b
ok := a > b && b > 0
⚡Example (Edit & Run)

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operators.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
a := 7Declares/initializes variables.
b := 3Declares/initializes variables.
fmt.Println(a + b)Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Go is used for backend services, CLIs, and cloud tooling.
⚠Common Mistakes
  • 1Ignoring error handling and writing huge functions.
✅Best Practices
  • 1Keep functions small and handle errors explicitly.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Operators
Go Data
∙ Chapter 012

Go Arrays

Learn Go Arrays with a small example you can edit and run.

📝Syntax
a := [4]int{1,2,3,4}
⚡Example (Edit & Run)

Edit the Go code below and click Run. The output panel shows the extracted Expected Output notes (or simple prints).

arrays.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
nums := [4]int{1, 2, 3, 4}Declares/initializes variables.
sum := 0Declares/initializes variables.
for _, x := range nums {Declares/initializes variables.
sum += xGo line.
}Go line.
fmt.Println(sum)Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Data structures model your API payloads, configs, and in-memory state.
⚠Common Mistakes
  • 1Using arrays when you need slices, or forgetting map key checks.
✅Best Practices
  • 1Prefer slices for dynamic lists; validate map lookups when needed.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Arrays
∙ Chapter 013

Go Slices

Learn Go Slices with a small example you can edit and run.

📝Syntax
s := []int{1,2,3}
s = append(s, 4)
⚡Example (Edit & Run)

Edit the Go code below and click Run. The output panel shows the extracted Expected Output notes (or simple prints).

slices.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
s := []int{1, 2, 3}Declares/initializes variables.
s = append(s, 4)Appends to a slice.
fmt.Println(len(s))Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Data structures model your API payloads, configs, and in-memory state.
⚠Common Mistakes
  • 1Using arrays when you need slices, or forgetting map key checks.
✅Best Practices
  • 1Prefer slices for dynamic lists; validate map lookups when needed.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Slices
∙ Chapter 014

Go Struct

Learn Go Struct with a small example you can edit and run.

📝Syntax
type User struct { Name string }
⚡Example (Edit & Run)

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struct.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
type User struct {Declares a struct type.
Name stringGo line.
Level intGo line.
}Go line.
func main() {Program entry point.
u := User{Name: "Mana", Level: 2}Declares/initializes variables.
fmt.Println(u.Name)Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Data structures model your API payloads, configs, and in-memory state.
⚠Common Mistakes
  • 1Using arrays when you need slices, or forgetting map key checks.
✅Best Practices
  • 1Prefer slices for dynamic lists; validate map lookups when needed.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Struct
∙ Chapter 015

Go Maps

Learn Go Maps with a small example you can edit and run.

📝Syntax
m := map[string]int{"SQL": 2}
fmt.Println(m["SQL"])
⚡Example (Edit & Run)

Edit the Go code below and click Run. The output panel shows the extracted Expected Output notes (or simple prints).

maps.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
m := map[string]int{"Go": 1, "SQL": 2}Declares/initializes variables.
fmt.Println(m["SQL"])Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Data structures model your API payloads, configs, and in-memory state.
⚠Common Mistakes
  • 1Using arrays when you need slices, or forgetting map key checks.
✅Best Practices
  • 1Prefer slices for dynamic lists; validate map lookups when needed.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Maps
Go Control Flow
∙ Chapter 016

Go Conditions

Learn Go Conditions with a small example you can edit and run.

📝Syntax
if n > 0 {
  fmt.Println("pos")
} else {
  fmt.Println("non-pos")
}
⚡Example (Edit & Run)

Edit the Go code below and click Run. The output panel shows the extracted Expected Output notes (or simple prints).

conditions.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
score := 75Declares/initializes variables.
if score >= 90 {Conditional branch.
fmt.Println("A")Outputs text using fmt.
} else if score >= 75 {Go line.
fmt.Println("B")Outputs text using fmt.
} else {Go line.
fmt.Println("C")Outputs text using fmt.
}Go line.
}Go line.
🏢Real-world
  • 1Control flow powers validation, business rules, and batching work.
⚠Common Mistakes
  • 1Missing edge cases and boundaries.
✅Best Practices
  • 1Test with boundary values and keep conditions readable.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Conditions
∙ Chapter 017

Go Switch

Learn Go Switch with a small example you can edit and run.

📝Syntax
switch day {
case 1:
  fmt.Println("Mon")
default:
  fmt.Println("Other")
}
⚡Example (Edit & Run)

Edit the Go code below and click Run. The output panel shows the extracted Expected Output notes (or simple prints).

switch.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
day := 3Declares/initializes variables.
switch day {Switch selection.
case 1:Go line.
fmt.Println("Mon")Outputs text using fmt.
case 2:Go line.
fmt.Println("Tue")Outputs text using fmt.
case 3:Go line.
fmt.Println("Wed")Outputs text using fmt.
default:Go line.
🏢Real-world
  • 1Control flow powers validation, business rules, and batching work.
⚠Common Mistakes
  • 1Missing edge cases and boundaries.
✅Best Practices
  • 1Test with boundary values and keep conditions readable.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Go Golang Go Switch
∙ Chapter 018

Go Loops

Learn Go Loops with a small example you can edit and run.

📝Syntax
for i := 1; i <= 3; i++ {
  fmt.Println(i)
}
⚡Example (Edit & Run)

Edit the Go code below and click Run. The output panel shows the extracted Expected Output notes (or simple prints).

loops.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func main() {Program entry point.
for i := 1; i <= 6; i++ {Declares/initializes variables.
if i == 3 {Conditional branch.
continueGo line.
}Go line.
if i == 5 {Conditional branch.
breakGo line.
}Go line.
fmt.Println(i)Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Control flow powers validation, business rules, and batching work.
⚠Common Mistakes
  • 1Missing edge cases and boundaries.
✅Best Practices
  • 1Test with boundary values and keep conditions readable.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
📈SEO

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Go Golang Go Loops
Go Functions
∙ Chapter 019

Go Functions

Learn Go Functions with a small example you can edit and run.

📝Syntax
func add(a, b int) int { return a + b }
⚡Example (Edit & Run)

Edit the Go code below and click Run. The output panel shows the extracted Expected Output notes (or simple prints).

functions.go
📝 Edit Code
👁 Output
💡 Tip: keep a // Expected Output: line so the output panel has something to show.
🔍Line-by-line
LineMeaning
package mainDeclares the package name.
import "fmt"Imports packages (like fmt).
func add(a, b int) int { return a + b }Declares a function.
func main() {Program entry point.
fmt.Println(add(4, 6))Outputs text using fmt.
}Go line.
🏢Real-world
  • 1Functions help you reuse logic and keep code DRY.
⚠Common Mistakes
  • 1Too many parameters and unclear names.
✅Best Practices
  • 1Use clear names and small, focused functions.
📖Summary & Practice
  • 1Edit the example and rerun to learn faster.
  • 2Prefer clarity first; optimize later.
💡Practice: answer the questions below, then modify the example to match your answers.
  • 1Change one value and predict the output.
  • 2Add one edge case and handle it.
  • 3Explain the rule in 1 sentence.
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Keywords (topic intent):

Go Golang Go Functions
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