I was reviewing my notes from my French class and I can not find the meaning of this sentence anywhere. What does it mean exactly?
If the phrase is used in a sentence such as:
Il ne parle que [le français]
It means he can only speak (and understand) [French].
If it is used in a sentence like:
Il ne parle que de [cette journée]
It means he talks only about that [day].
It means the same as:
He only understands/speaks...
The only thing he understands/speaks is ...