We will have a look at direct fit bids of the responder after the opening of one in a Major.
The most important thing to remember is that if the responder chooses to fit directly, he does not have a strong hand.
A fit on the 2-level promises a hand with 6-10 points and 3 or 4 trumps.
A fit on the 3-level promises a hand with 10 - 12 points and 4 trumps.
A fit on the 4-level is a weak bid. It shows very few points and a hand with 5 trumps.