Migrate Source Code
So, Git, TFVC, and SVN, actually there is most source controls exist today, like Helix VCS, Mercurial, Rational ClearCase, CVS, Kiln, Bazaar, Fossil, Monotone, Plastic SCM, AWS CodeCommit and more. Some of them will disappear...
I only list Git, TFVC, SVN because I've been used these around for awhile, they're all popular.
Based on what I have seen so far, I think it's better to just use Git instead.