What is the difference between French in Belgium and french in France?

Is it just an accent difference, and a few words here and there? Or would it be hard for someone from France to speak to a Belgian?

FRENCH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!?

Does anyone know what the word preau means? (There is an accent on the e) (It isn’t in my dictionary!)

How does Quebec French and French spoken in France differ?

I’ve heard that French-speaking people in Quebec have an accent which differs from French spoken in France, is this true? If so, would people from France and Quebec still be able to understand each other in conversation?