A strategy in poker is a set of the most optimal actions a player can perform during the game. Strategies can vary depending on the size of the stack, the number of opponents, and the type of game.
Short stack strategy (less than 40 big blinds)
This strategy is based on the principle that if the stack is rather small compared to the size of a big blind, a good result can be achieved even if the probability of your victory is low. For example, with a 1$ stack, a 10$ pot, and a 20% chance of victory, an all-in results in 8 cases of losing 1$ and 2 cases of winning 10$ for every 10 draws. This means that the mathematical expectation of this move is 12$.
Medium stack strategy (more than 40 big blinds)
A good mid-stack poker strategy involves playing a wide variety of strong hands. Your position is something to keep in mind, so you should play accordingly. Aggressive plays after the flop are also something to consider. This strategy involves playing your draws and top pairs very fast.
Deep stack strategy (100 and more bug blinds)
If you are on a deep stack, there is no reason to only play the absolute premium hands. Instead, you want to try and get in the mix with some speculative hands that have the potential to flop big. While you don’t want to be set mining with a short stack in an MTT, your small and middling pocket pairs become much more powerful in deep stack poker situations.
You have the required implied odds to see the flop and try to stack someone overplaying their big pocket pair.