You will probably never need to know what
collocations are, but school still teaches you what it is for no reason other then to just waste your time.
Also collocations are
just words that fit together, like a hard
frost
Teacher: Okay class, today we are going to learn about
collocations!
Student: Will there ever be a situation in life where
we need to know what collocations are?
Teacher: ...
Teacher: No.