The key to any poker game and its variations is knowing the hand rankings. Of course you can always bring a cheat sheet to the game, but that will just give you away.
Royal flush is the ace, king, queen, jack and ten of any suit. A royal flush is an unbeatable hand.
Straight Flush: Five suited cards in sequence.
Highest rank at the top of the sequence wins when players tie.
Four of a Kind: Four cards of the same rank, and one side card (kicker)..
Highest-ranking Four of a Kind breaks a tie.
Full House: Three cards of the same rank, and two cards of a different, matching rank.
Full House with the highest ranking three cards breaks a tie.
Flush: Five suited cards.
If multiple players have a flush, subsequent card rankings will be used, one at a time, to determine the winner. If all five cards are identical, the pot will be split. The suit itself is never used to break a tie in poker.
Straight: Five cards in sequence.
Highest-ranking card at the top of the sequence breaks the tie.
Note: The Ace is the only card that may be used at the top or bottom of the sequence. A,K,Q,J,T is the highest (Ace high) straight; A,2,3,4,5 is the lowest (Five high) straight.
Three of a kind: Three cards of the same rank, and two unrelated side cards.
Highest ranking three of a kind breaks a tie.
Two pair: Two matched-rank cards, two different matched-rank cards, and one side card.
Highest pair breaks a tie. The second pair or side card will break a tie if certain cards are identical.
One pair: Two matched-rank cards, and three unrelated side cards.
Highest pair breaks a tie. The player with the first superior side card will break a tie if pairs are identical.
High card: Any hand that does not qualify under a category listed above.
In the event of a tie: Highest card breaks a tie. If first cards are identical, the first superior card wins the game.