How do you fish properly in fortnite?

The question is probably funny, but I don't know how to fish properly in fortnite, I know you should fish in a fish spot, but I don't know when to pull out the line

The rod dips down briefly (so quickly) and you see bubbles, then you pull the rod out.

Yep just like that… Aja if you have good weapons take the Pro Angel if you can find one and if you have bad weapons take a normal one