I weep for the world now that git is too difficult to understand.

It used to explain itself through building your own version of git. You have a file named hash that tracks changes on each file named foo... now all the changes are in a directory named hash...now your changes have to be merged with others...

It's kind of up there with next steps after if then else fi. Some things will always be difficult, but diffs and commit and picking one of two possible diffs from two windows should not be one of them.