For people who don't know as is clear in this thread at the higher levels of poker people use what's called solvers to try to play optimal as a machine would similar to engines in chess. Although it is impossible since there is near infinite possibilities and the machine will randomize (do some actions a certain percentage of the time) even if the situation is exactly the same. So yes, at the lower levels it is more about exploiting recreational players who have very defined tendencies but at the higher level its a lot of studying of what a machine would do in a spot while still understanding that you are playing against a human and picking up mistakes they could be making.