system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does counting cards work in blackjack?
gpt
You assign point values to each card.

* 2, 3, 4, 5, 6 ➤ +1
* Cards 7, 8, 9 ➤ 0
* Cards 10, Jack, Queen, King, Ace ➤ -1

After each card is played, add the points of the count to the running total.  The lower the count is, the more likely it is that you'll receive a lower card.

The higher the count is, the more likely it is that you'll receive a high card.

Counting cards does not guarantee you to win over the casino.  Generally if the cameras catch you, you'll be thrown out and to truly have an advantage, you need to be really good.  Even then, you need to have a lot of chips, because the odds are so slim, that you'll only truly make money in the long run.  It is statistically likely that you'll lose because you'll wind up on a bad streak and the casino can outlast you because they have more money.