Is there really no such thing as a stupid question? I hope so. I just remembered my bike is doing something weird and I wanted to know if it means I have to fix something.

You know how when you push your bike, it makes a clicking noise and the peddles don't spin? When I push my bike now the peddles spin. I'm guessing I have to either grease something or loosen something. Or just ignore it. IDK.
Please advise.