Merci ! 

Another important word you want to know is “Merci“, it means “Thank you“. So when someone does a for for you or you receive something then you would use it.

(insert merci audio)

Other situations examples

If someone hold the door for you → “Merci !“

If the baker give you your pain au chocolat → “Merci !“

If you drop something on the floor and someone help you take it → “Merci !“

De rien

“De rien” is the equivalent of “You’re welcome” it literally means “it’s nothing“, so you are the one giving an object or helping someone then you could reply “De rien” once they say “Merci“