Answer:
Improve
The easiest poker game is probably 5 card single draw poker.
In this variant each player receives 5 closed cards. After distribution of the first 5 cards there is a round of betting (Limit betting is the easiest).
Then a player can exchange 0 to 5 cards depending on the hand.
After the draw there is another round of betting. After this round of betting, the cards are being shown and the player with the best hand wins.