Ok, not putting this in a comment, because not sure how tags in comments work in all clients.

I am thinking about writing a #cycling training app, but not sure how exactly it fits into any of these. It could maybe fit in learning a new language, but if it's like "zero to app" in 3 months or something, I don't know how useful it will be. I mean, I have other stuff to do, but largely right now I am being paid to learn #Java (and Java tooling).

Interestingly, 12 weeks is what this bootcamp uses: https://www.thesoftwareguild.com/coding-bootcamps/java-training/