I don't learn "technologies", I chip away at "topics". For instance, when I learned OpenAPIv2 it wasn't because I wanted to use OpenAPIv2, it was because I want

I don't learn "technologies", I chip away at "topics". For instance, when I learned OpenAPIv2 it wasn't because I wanted to use OpenAPIv2, it was because I wanted to solve some pains I was experiencing with managing multiple REST backend versions and I saw OpenAPIv2's architecture could help me decompose the painful areas. Knowing what you want to solve, or learn, is key to that, and just like regular projects can be subject to scope creep if you don't have strong boundaries for it.