skillz 4 nerdZ lol!
how about: social skills!
nerds suck at life in general for this reason. 99% of the time you see a nerd failing it's because of underdeveloped and/or atrophying social skills.
nerds (I mean hessians, lol) fail at leadership, with women, at networking, at advancing their careers, at making friends, etc; the list goes on. which is why they're butthurt by the world.
practical skills like cooking, home repairs, and car maintenance are nice to have but not really essential to getting around in postindustrial society. learning how to grow your own food or how to use/maintain small arms are even less useful. you can insert martial arts, sailing, rock climbing, or whichever macho pastime you prefer here.
it's good to challenge yourself and try to learn something you suck at or never thought you'd do well, I guess, as long as it doesn't take away too much time/energy from getting better at what you're actually good at.