codingWithGit

I use zim-wiki. http://zim-wiki.org/ It's open source and uses a text based file format.

It will be awesome if someone can animate these into a movie or a gif.

Spaced repetition is more for remembering things. I've had good experience with it. However, I don't think the methods used in this article are valid to test spaced repetition. The test the author used are solving problems. Solving a problem require much more than recalling facts. Just because you remember something doesn't mean you understand it. In my opinion this is a very flawed experiment.

you can always do this in the command line locally.

This is good insight. makes a lot more sense. I think this will take care of 99% of use cases for sqqshing/rebasing.

However, I think this is something that will have to be built into git itself, not by Github.

If I feel like the history of a branch is important, I add a git tag to the branch head before rebasing. I have a naming convention for these tags. Then I usually do a rebase -i on to the main branch.