If you're interested in how to git submodule and link multiple projects together, then here is the git submodule tutorial you're looking for. This is actually an aggregation of a few different git submodule tutorials that are already published on YouTube and TheServerSide. Putting them all together into one spot provides a comprehensive 'hot to git submodule' tutorial, taking you from an introduction to the submodule add command, through the process of how to create git submodules with GitHub and GitLab, and then finally tutorials on how to git submodule update and delete. You'll be dangerous after you've viewed this git submodule tutorial.