Without betting, the basic rules of poker are as follows:
The following is a list of 5 card poker hands, from the best to worst, without jokers or wild cards in play
10-J-Q-K-A, all of the same suit.
Five cards, of the same suit, in order, such as 5-6-7-8-9 all of clubs.
Four of the same card, such as 3-3-3-3-8.
Three of a kind and a pair together, such as 8-8-8-5-5 or K-K-K-A-A
Five cards all of the same suit, but not in order, such as 4-6-7-Q-K of spades.
Five cards in a row, such as 2-3-4-5-6, but not all of the same suit.
Three cards of the same number or rank, such as 7-7-7 in a hand such as 7-7-7-5-Q.
Two pairs of cards of the same number or rank, such as Q-Q-5-5 in a hand such as Q-Q-5-5-4.
Two cards that match, like K-K.
If no one has any of the above hands, the player with the highest card in their hand wins.
High card will also be important if you tie another player. For example, you both have 2 pair of the same cards; you have Q-Q-5-5-9 and your opponent has Q-Q-5-5-2, you would win because 9 beats a 2. If you had K-K-5-5-9 you would win based on having the higher pair, kings beat queens.