Someone told me that while I am practicing weight lifting using dumbbells, namely lifting the dumbbell from low waist region to say shoulder or chest level, if I move my shoulders while lifting it up, then it might lead to a shoulder sprain. Is what he says correct? If so, then how exactly am I to lift dumbbells without moving my shoulders even a tiny bit?
I guess you are doing some sort of bicep curls. The safest way I can imagine would be to remove momentum. You can cheat yourself by standing with your back against a wall with your back and doing them in a cotrolled motion. If you are doing tricep extensions. .. I can suggest an additional exercise that is pretty effective (where you don't move the shoulders) if you want to try. It is called the Tate-Press: https://youtu.be/MJJwvJ9i7Mo
Hope that helps.