What are the most common checks which occur in chess?
Back rank checks (and check mates) must be the number one. I would suspect that bishop checks from h2/h7 on the castled king should also be up there in the top 10 if not number two.
Assuming you are Black, you have checked your opponent - your Queen on d1 is putting his King on g1 in check (and checkmate).
Edit: assuming Rewan Demontay's reading of your question is correct, then there's no stipulation that you have to check your opponent before checkmate. You can see this in well-known short checkmates, e.g. Scholar's mate. 1. e4 e5 2. ...