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Could some define this concept: "Play to win stacks, not pots." Thanks.
It simply means that the goal of poker is to win as many chips/money as possible.
This saying suggests that it's better to win a few big pots than many small pots. This is line with tight play, where you enter fewer hands but you do so with stronger starting cards.
There could be loose players whose post-flop skills are so great they can win lots of small pots in addition to winning the big ones. So to the extent that this quote represents the conventional wisdom, it's a rule with exceptions.
But if you're wondering what the concept is, it's simply that it's better to play to win big pots with big hands rather than get tangled up in lots and lots of hands where you'll probably end up bleeding money.
It's a corollary to "tight is right" imo.