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Let’s write our first hello world program. We can start by initializing a module. For that, we can use the go mod command. 
$ go mod init example
Don’t worry about what a module is right now! We will discuss that soon. For now, assume that the module is basically a collection of Go packages.
Moving ahead, let’s now create a main.go file and write a program that simply prints hello world. 
package main

import "fmt"

func main() {
	fmt.Println("Hello World!")
}
If you’re wondering, fmt is part of the Go standard library which is a set of core packages provided by the language.

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Structure of a Go Program

Now, let’s quickly break down what we did here, or rather the structure of a Go program.
1

Package Declaration

First, we defined a package such as main.
package main
2

Imports

Then, we have some imports.
import "fmt"
3

Main Function

Last but not least, is our main function which acts as an entry point for our application, just like in other languages like C, Java, or C#.
func main() {
  ...
}
Remember, the goal here is to keep a mental note, and later in the course, we’ll learn about functions, imports, and other things in detail!

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Running Go Code

Finally, to run our code, we can simply use go run command. 
$ go run main.go
Hello World!
Congratulations, you just wrote your first Go program!

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