> I guess it’s all the other non-git stuff

Yes, you want to run automated builds, unit test, end to end test, UI tests, make it easy for testers to deploy specific versions / tags to internal server. Also kick off builds for iOS on mac computers. We use Teamcity for that.

Tracking of issues, feature and epics. Maybe also knowledge base / wiki. We use Jira.

And pull requests. Bitbucket.