There are any number of blackjack card counting systems out there, ranging from complex to simple. Obviously if you have decided to begin learning card counting it makes sense to start with an easy system. Then, once you have become skilled at using that system, learn a newer more complex one if you would like.
The easiest blackjack card counting system is also one of the most common. It is called the Hi Lo system, and it is the one that the majority of beginning counters start with. It is a basic counting system whose only demand on your math skills is to add and subtract a positive one and a negative one.
Almost all of the cards have a positive or negative counting value assigned to them. The only cards that do not are 7, 8 and 9. Those three are considered neutral and have no value in this counting system. The other cards are assigned like so:
2, 3, 4, 5, 6 are all +1
10, J, Q, K, Ace are all -1
The way this system works is that the player will add up the values of the cards that are on the table, including the dealer