I thought I would explain the rules to 7 card stud as it is the basis for many other games (e.g. Baseball.)
3 to 10 players. Use a double deck for more than 7 players.
How to play:
Each player antes. The dealer deals two cards face down and one card face up to each player. Players can now look at their face-down (hole) cards. There is a round of betting starting with the player with the highest face up card. Players can fold during any of the betting rounds if they choose not to bet.
The dealer deals one card face up to each player. There is now another round of betting starting with the player with the highest hand made with their face up cards.
Repeat two more rounds of dealing one face up card then betting. One final card is dealt face down to each player and there is a final round of betting starting again with the highest face up hand.
After the final round of betting players should make their best five card hand out of their seven cards. Each player reveals their hand and the player with the best poker hand wins the pot.
Variation: Five card stud is played with the same rules, but after the initial two up, one down deal there is one more card dealt face up and one face down. There is a final bet and then the reveal. In 5 card stud players use all their cards.