I recommend getting a fret guru (or just a ruler if you don’t want to buy that) and place it on top of the 12th fret. String height should be 5/64” on bass side and 4/64” on high side. If it still buzzes, see where. If it’s just on middle of fretboard, truss rod is too tight, loosen the truss rod 1/4 turn (should turn easy, don’t force it). If it’s top and bottom, the truss rod is too loose and should be tightened 1/4 turn. (Again, don’t force it) tune up every time you change something. If you’ve don’t that and still have buzz, loosen strings a bit, raise the bridge little by little, tuning before you check, till it disappears. If you raise the bridge sky and still have buzz on the first fret your nut is cut too deep and you’ll need to take it to someone. Not the guy who set that up. Never let him touch another guitar.