Go to. Doctor immediately

Hi you can use mittens on the thumb, baby will gradually leaving habit

Distract him with the help of toys... various games...

Exposure of every knowledge.

He might have not liked the dish which you have sent ...

Give the food whichever your baby likes...

Dont force her... just talk to her.. she ll learn automatically

Mostly babies imitate everything around them...this is a way of learning also.. So its very important to keep a check on what is allowed to watch or how you behave in front of them ... Never give remote in their hand... And allow them only those things which won't harm them or others..

Spend time with him. Talk to him, surrender to him on few occasions NOT ALL. Kids at this age needs lot of attention. Even if you move a spoon and paper they could get angry. Its a phase in development of a child. Be patient, polite, soft yet stern with the kid. It should help

Can he understand anything you say to him?

Beating is not the right way. Talk to your child politely both in private. You should take your child away from the situation and tell your child unless they learn how to behave around other children they will not be able to continue playing with other children. Also, another good lesson to teach your child is how to apologize. This should be done in front of other children so that your child knows what the right way to do things are.