[alun]

My list:

- General knowledge: by intentionally curating the information I consume

- Chess: by practicing tactics, watching videos, and learning new openings

- Salsa: by dancing a lot

- SEO: by building a side project and trying to get it to rank well on Google

[FergusArgyll]

> Chess

Depending on your level, I've found that reviewing annotated master games have a high return. Youtube works for this as well.