Since
launching ABAP on Exercism, 10000+ students have signed up for the ABAP track, and 215000+ exercises have been submitted.

Exercism is a free learning platform, helping you try different programming languages.
Its single click sign up and free, no need to install anything. Since the initial launch of the ABAP track, more exercises have been added, and lots of fixes done to the runtime.
The community can easily add more exercises by opening a
pull request on github.
Want to know more, here is the replay of the launch stream from last year,
https://www.youtube.com/watch?v=F2zBmjqM8xo
Join the ABAP track via
https://exercism.org/tracks/abap