French or american Billard, 8 Ball, Straight Pool ... There are a lot of varieties of billiard and all are played with different rules. Not easy to become familiar with each rule. Still, they have a common basis.
You will have to strike billard balls into holes with a cue stick. Attention to the cue ball, you should never put this one into a hole. This results in a penalty.
Usually pool is played against an opponent, but it is also possible to play online against a computer. So, no need to know another person who knows how to play. Just play online , for free!