From: https://www.youtube.com/watch?v=uBjoTxosSys&feature=em-subs_digest-vrecs

gofmt - replace with goimports

go run main.go
go build
cat > main.go
package main
import "fmt"
func main() { fmt.Println("Hello Rik)}
<CTRL-D>
go run main.go
gofmt -w main.go
cat main.go

go build
ls ./demo

GOOS=windows go build

file program.exe to show it’s a Windows application.