Good poker is all about context. What makes for context?
What's your position? How do the others play -- loose or tight? Aggressive or passive? Have they already acted in the given hand? What did they do? What cards are on the board? How likely are you to be ahead? If behind, how likely are you to draw out to be ahead? How big is the pot? Is it worth chasing? How big is the bet to you relative to that pot and your odds of winning?
Context, context, context.
There is NO simple poker question that can be answered without context. Even the obvious ones fail in certain situations. For example:
Can you play 65s in limit Hold'Em? Typically, no. But if a bunch of people have limped in, you should probably play it from the small blind, since it's half price. (Not to mention the fact that you have all those limpers suggests you're playing loose players, who will pay you off if the 65s happens to make a hand.)
Can you slow play pocket aces in limit Hold'Em? Typically, that's stupid. But if you have them under the gun at a timid table, doing a delayed raise is much more profitable. Or, if you have them in the small blind and nobody has limped in, you should certainly just call and let the big blind get a flop in hopes of getting more money from them. (If you're lucky, the big blind will try to steal, and you can lower the boom.)
Poker is all about context and subtlety. StraightforwardPlay is usually correct, but there are subtle conditions which will influence the most profitable play. Each condition will nudge you towards one play or another. Generally, many of the subtle conditions must all push you in the same direction before you can deviate from straightforward play.
If you learn to recognize the subtleties, you can greatly increase your poker profits. If you do not, and you still deviate from straighforward play frequently, you may be afflicted with FancyPlaySyndrome. That, or, you're just a donk.