Add a dependency package, or download packages in legacy GOPATH mode. More information: https://pkg.go.dev/cmd/go#hdr-Add_dependencies_to_current_module_and_install_them.
go.mod
in module-mode or install the package in GOPATH-mode:go get example.com/pkg
go get example.com/pkg@v1.2.3
go get example.com/pkg@none