I think DJ'ing and Reddit teach skills but not necessarily the skill of rationality.

Knitting, especially when you design your own patterns, does teach you the ability to make things. It sometimes disturbs me how possible it is to go through an adult life without making anything, and how long I go without making anything. (I'm not just talking about handicrafts; I'm talking about the process of designing and producing an entire new thing, that you can call "yours." Writing a program is "making something.")