52 (excludes jokers)
Spade > hearts > diamonds > clubs
Trio - three cards of the same rank. Three aces are the best trio and three twos are the lowest.
Straight run - three consecutive cards of the same suit.
Normal run - three consecutive cards of any suit.
Colour - any three cards of the same suit which are not in sequence.
When comparing two colors, compare the highest card; if these are equal compare the second; if these are equal too, compare the lowest. Thus the highest color is A-K-J and the lowest is 5-3-2.
Pair - two cards of the same rank.
Between two such hands, compare the pair first, then the odd card if these are equal. The highest pair hand is therefore A-A-K and the lowest is 2-2-3.
High Card - three cards that do not belong to any of the above types.
Compare the highest card first, then the second highest, then the lowest. The best hand of this type is A-K-J of mixed suits, and the worst is 5-3-2.
Any hand of a higher type beats any hand of a lower type - for example the lowest run 4-3-2 beats the best color A-K-J.