I found lots of posts use a phrase "grammar point". For example,
If you study the grammar point comparison forms of adjectives you will find that ...
where comparison forms of adjectives appears to be one grammar point.
Is "grammar point" a term in grammar? What is a "grammar point"? Could anything relate to grammar be one grammar point?
A: If you study the forms of adjectives you will find that . . .
B: would you provide some reference to that grammar point?