Other answers talking about using git features are assuming that you don't care about Wiki/PRs/Issues/Labels/etc that are GitHub metadata not part of your repo

Other answers talking about using git features are assuming that you don't care about Wiki/PRs/Issues/Labels/etc that are GitHub metadata not part of your repo history. But GitLab does have feature support for extensive importing and mirroring. https://docs.gitlab.com/ee/user/project/import/github.html https://docs.gitlab.com/ee/user/project/import/github.html (Import your project from GitHub to GitLab) has a section on project mirroring.