Games have taught me to
Rpgs: read, plan and strategize, money management, being good is more fun and gets you more quests and items.
Persona4: Learn to balance life with saving the world. English skills
Shenmue:Time management
Strategy: tactics
FPS: how to anticipate an attack and to be observant of my surroundings. Also on how to conserve ammo. Any weapon can be a good weapon in the hands of a professional.
Adventure games: expect the unexpected and the oddest solution.
Stealth: patients is rewarding, how to sneak around.
General: critical thinking, planing, time management, and not to give up

Super Mario Bros. 3: Italians can fly so long as they wear a raccoon costume, even a shoddy one that just has the ears and tail.

This. I played that for so long, and for such long sessions, that I was sure that Bohemia rose to be THE dominant nation in central, western and eastern Europe.
Unless you play it totally renegade, in which case you flitter rather schizophrenically between badass and asshole.
Borderlands, Fallout 1, 2 + 3. as well as some of the more violent FPS's: If you shoot someone in the head, there is a chance it will explode or fly off the body from the neck at an absurd speed.

"Never trust in what the dealer claims..."
- The Secret Of Monkey Island

Me too!
In the intro of "The great battles of Caesar" there were the correct succession of battles of Roman civil war.

All rts games: Build later, expand first. Stupid Warcraft 3...=)

Absolutely nothing, well, actually, after Baldur's Gate I'm suspicious of any damsels in distress that throw themselves at me... which is lots, honest! ¬_¬