If you want to learn blackjack card counting, you need to master two skills: one, being able to identify the value of a card with the speed of light and two, add all the values up pretty fast regardless of the number of cards. Okay, so before you start working on your value identification skills, you need to decide what counting system you like the most, because the values are not universal and vary from system to system. You can find a good chunk of material about any of them online and see which one makes the most sense to you. Then you can start “programming” your brain. For instance in hi-lo system the face cards and an ace mean minus one, so while you will be listing through the deck of card, every time you see one of them subtract one. Same with the cards of different value, just remember that it will take some time.
The best way to learn how to count cards values up is to use a trainer or simulator. You need to create the conditions in which multiple cards are dealt in a matter of seconds. Online games or trainers will be just perfect, because you wouldn’t have to worry about dealing the cards, just watch them show up on the screen and try to count.