how to learn to do neck curls

first, you sit on a table like this or on a bench then lay your back on the bench or table, and then you take the dumbbell or the plate and put it on your forehead.

then you curl your neck.

mistakes you must avoid doing don't use your biceps with neck curls.
the next one is don't use your abs or back with neck curls only your neck the full focus is on your neck to get bigger.
These are the beginner sets you must to 50 x3