Go/Quick Start

Create a module

Create module and source file.

go mod init sandbox/hello
touch hello.go

Add source code.

package main

import "fmt"

func main() {
	fmt.Println("Hello, World!")
}

Run.

go run .

Work with 2 modules

mkdir main greetings sucks
cd greetings
go mod init sandbox/greetings
cd ../sucks
go mod init sandbox/sucks
cd ../main
go mod init
go mod edit -replace sandbox/greetings=../greetings
go mod edit -replace sandbox/sucks=../sucks
go mod tidy

naming convention table

Element	Visibility	Casing Rule	Example	Notes
Package	N/A	Lowercase	package utils	Packages are namespaces. They must be concise and descriptive.
Module	N/A	kebab-case (Lowercase with hyphens)	github.com/user/my-project	Used for import paths and module names. Kebab-case is standard for URLs.
Struct / Type	Exported (Public)	PascalCase	type User struct	Used to define public data structures.
Struct Field	Exported (Public)	PascalCase	Name string	Fields starting with a capital letter are visible outside the package.
Struct Field	Unexported (Private)	camelCase	age int	Fields starting with a lowercase letter are only visible within the package.
Function	Exported (Public)	PascalCase	func GetUser() User	Functions starting with a capital letter are public.
Function	Unexported (Private)	camelCase	func internalHelper()	Functions starting with a lowercase letter are private to the package.
Variable	Exported (Public)	PascalCase	var MaxUsers int	Variables starting with a capital letter are public.
Variable	Unexported (Private)	camelCase	var count int	Variables starting with a lowercase letter are private to the package.
Constant	Exported (Public)	ALL_CAPS	const MaxUsers = 100	Used for fixed, immutable values.
Interface	Exported (Public)	PascalCase	type Reader interface	Interfaces are typically named to describe the action they perform (e.g., Reader, Writer).
Method	Exported/Unexported	Follow Function Rules	func (u *User) GetName() string	Methods follow the same visibility rules as functions.