Each card in the Jacks or Better category has a distinct value. A 3 can only count as a 3, a king can only count as a king, and so forth. The lone exception is the ace which can count as the lowest or highest card in a straight or straight flush. Each game in the Wild Card category has one or more cards which can count as a card of any rank or suit. They are called wild cards and hence the name of the category. In the game called Deuces Wild, each deuce (2) is wild. Each can be used as any other card in the deck when it is advantageous to do so. In a Joker Poker video poker game, the joker is the wild card.
Well, the charts on our site are on roughly accurate to within 0.1% of perfect play. So, if you find that game that returns 100.5%, you would be actually earning about 100.4% with our charts - not too bad. Not many charts get much closer than 0.1% because they would have to be extremely long and complicated to explain the subtle differences in rare hands.
A straight is a hand with consecutive ranks, like 9? 7? 10? 8? 6?.  Notice again that the cards don't have to appear in order.  The order of face cards, from lowest to highest, is Jack, Queen, King, Ace, which we abbreviate J, Q, K, A.  An ace can also count as 1, to complete a straight where the other cards are 2, 3, 4, and 5.  But it can't count as both a low and a high card, e.g., Q K A 2 3.