A goalkeeper is considered to be in control of the ball with the hand(s) when:

the ball is between the hands or between the hand and any surface (e.g. ground, own body) or by touching it with any part of the hands or arms except if the ball rebounds from the goalkeeper or the goalkeeper has made a save

holding the ball in the outstretched open hand

bouncing it on the ground or throwing it in the air

A goalkeeper cannot be challenged by an opponent when in control of the ball with the hand(s).

Learn the rules guys before you complain about referees endlessly