When figuring out conditional probabilities, here are some common mistakes to watch out for:

1. Understanding Terms: Make sure you know what events you’re focusing on. For example, when you see $P(A | B)$, it means the chances of $A$ happening given that $B$ has happened.

2. Not Recognizing Independence: Just because two events look related, it doesn’t mean they depend on each other. Always check to see if they really do.

3. Mixing Up Numbers: Make sure you have the right numbers. The top number (numerator) should be $P(A \cap B)$, and the bottom number (denominator) should be $P(B)$.

4. Forgetting About All Possible Outcomes: If you're looking at more than one event, don’t forget to include every possible option.

If you avoid these mistakes, you'll do great with conditional probability!