[Dobiasd]

EditGym - text editing training: https://www.editgym.com/text-editing-training/

It's a website for practicing manipulating text (start -> target, like a diff) quickly (timed) and efficiently (few keystrokes). The allowed keyboard shortcuts are only the "common" ones, that you can use in most "normal" (not Vim, not Emacs) text editors or IDEs.

I made this page not only because I was interested in building it, but also because I actually wanted to have such a training tool. Turned out, I really like using it, but almost nobody else does. :D (There are ads, but the revenue is basically zero.)