10. Low pair (two 10s or lower). Most new players keep a single jack or better rather than a low pair, and it's true that keeping that one high card will result in more frequent winning hands. But most of those will be 1-for-1 payoffs for a pair of jacks or better. Keeping the low pair will result in more two-pair, three-of-a-kind, full-house, even four-of-a-kind hands.
Video poker is a very volatile game, about four times as much as blackjack. In any form of gambling, short-term results mostly depend on normal mathematical randomness (what some might call luck). However, in the long run, results mostly depend on skill. If you play a game with a return of 100.76% perfectly, that does not mean that you will have a 0.76% profit every time you play. The 100.76% is an EXPECTED return. Much in the same way, if you flip a coin ten million times, the expected number of tails will be five million, but it is unlikely you will hit five million on the nose. Actual results will vary significantly from expectations, but the more you play, the closer your actual return percentage will get to the expected return.