So recently there had been a few articles here on Ars talking about MS making contribution to git to make it scale, and how the big boys are all using mono-repo instead of split repos at some ...

This SO post goes into how to use git checkout --orphan to create a new branch whose history is totally separate from the "main" one. This other SO post shows how to do something similar with Git ...

Did you create a new Git branch? Need to push that local Git branch to a remote repo like GitHub, BitBucket or GitLab? This example shows you how to git push new local branches remotely.