For a first step you can get away with just add, commit, push, and pull. Maybe reset, but tbh using git like svn at first is fine.
Next branch, checkout and merge. At this point show, log, bisect and blame also start to be useful.
I'm not a fan of stash, and would instead recommend reflog and cherry-pick as the first two advanced commands to learn. Then rebase and squash.
It's going to be a really shit 4 years. There could be a point of no return anytime along that based on a variety of issues, but IMO the most likely point of no return is if/when Trump moves to take a third term in '28. If that happens it's clearly dead no hope.