go mod

go mod init
go mod download
go mod vendor
go mod verify
go mod why
go mod tidy

Execute:

go mod init YOUR_NAME
go: creating new go.mod: module YOUR_NAME

It will create a go.mod file containing

 module YOUR_NAME

 go 1.14

go help mod

See also

• go mod [ init | tidy | verify | download, | vendor | why ], GOPATH
• Go, Gorutine: go [ mod | list | fmt, for | build | get | version | env | install | test ] go help, Go template, Echo go web framework, Go packages, Blank identifier