What are in your opinion the topics with the best cost/benefit (by cost I mean time dedicated) to advance your career as a DS, MLE or even SWE?

I was just curious about what would be some small things that I should have at least basic knowledge of as they would probably help me progress. In my case, as a DS with about 2 yoe, I could say that learning the super basics of git and docker helped me somewhat, especially taking into account that they took only a couple of hours. On the other hand, having a very good math theoretical basis is for sure very important …

advance advance your career basic benefit career case cost datascience knowledge least mean mle opinion progress small swe topics