Well, pretty much any RPG - used to play a lot of Neverwinter Nights, developed an addiction to TES and Fallout 3/NV just like everyone else, dipped my toes in the classic Fallouts in high-school

In addition, a lot of well-made RTS/management/sim games [Warlords Battlecry III, Stronghold, Stronghold Crusader, 40k: Dawn of War (the first and second batches, I devoured them as they came out, but III is… no), the C&Cs, several Total War titles, StarCraft, the SpellForce series, Age of Empires, the classics, pretty much], also taught me the importance of unit/team composition, which, to me, is an abstractised and simplified way of keeping track of such aspects. They don’t teach everything which one should keep in mind, but they sure taught me to keep an eye on skills in general.