The bettery of my phone draining so fastPlz give me solution.Device : Samsung galaxy M21

I ain't a good photographer. Just tried to keep a good shot.Device:- Samsung Galaxy M21

Hello guys,Am using Samsung Galaxy M21. Its 6/128GB variant. When I am playing call of duty mobilei saw a lot of lacking in the game.But when I play in Samsung Galaxy A50 (4/64 GB) with the same internet connection. I haven't saw any lackings.Pl...

I am a Samsung user. Using Samsung Galaxy M21.My device have not knox security sysrem. Please tell me how can I get it.