Git rebase in Visual Studio

In Visual Studio, do I need to rebase FROM the current branch (COREv2.0) ONTO master?

Yes.

One of the first rule of Git is that you can only change the branch you have checked out i.e. the “current branch”.

(Side note: The reason is because a lot of git actions could end up with conflicts to solve by the user and in this case, you need to have a working directory to work into.)

The ‘onto’ branch is the one with which you want to sync with.
With a feature branch, it’s most of the time master that you want to rebase onto..
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Does this screenshot represent what I’m wanting to do here?

Yes.

A picture could help understand :