There are a variety of combos in poker, and they can be used to gain an advantage over your opponents. For example, you can use two pair (two cards of the same rank) to create a flush, three of a kind to create a full house, or four of a kind to create a straight.
There are also other combos that can be used to gain an advantage, such as using two pairs together to create a quads or using three of a kind together to create a trip.
Combos can also be used defensively. For example, if you are playing against someone who is playing high-card poker, you may want to try and stay alive with two pair or three of a kind.
If you are able to do this, your opponent may fold more often, which will give you more opportunities to win later in the game.
A final note about combos is that they can be difficult to pull off successfully. If you are not able to create the desired combo quickly enough, your opponents may be able to take advantage and beat you handily.
