[sethammons]

The meat:

> go mod init creates a new module, initializing the go.mod file that describes it.

> go build, go test, and other package-building commands add new dependencies to go.mod as needed.

> go list -m all prints the current module’s dependencies.

> go get changes the required version of a dependency (or adds a new dependency).

> go mod tidy removes unused dependencies.

And you can use some sugar to declare exact versions you want.