What does it mean that the girl you like suddenly asks you to tell her jokes?

Um ... I don't know much about feelings.

There are probably the following possibilities:

I may feel bored and want to find something to talk about.

I want to test your humor (this kind of woman is very scheming and gossipy, so be careful when joking)

Maybe she feels uneasy and wants to talk to someone and make a joke to ease her mood.

In either case, a girl won't like you because of a joke, but it shows that she has a good impression of you. But don't confess rashly. Once the confession fails, she will ignore you, understand?