This is the 35th most frequent French word.
qu
The French word "qu" is a contraction of "que," meaning "that" or "which," often used before vowels or mute "h."
Used as a relative pronoun to introduce a clause referring to 'gateau'.
C'est un gâteau qu'il a fait hier.
It's a cake that he made yesterday.
Used in 'ce que/qu'' construction to indicate the direct object of 'veut'.
Je ne sais pas ce qu'il veut.
I don't know what he wants.
Used as a conjunction representing 'that' introducing a subordinate clause.