Your child has now learnt to emote and express as he is nearing the age of 4. You as a mother have to teach him several importance lessons on how to control certain emotions of anger and anxiety.
This is the age for children to develop negative behaviour as they are vulnerable to the surroundings. So you as a parent must prevent such things by teaching the kid how to be patient when he deals with different situations.
What you need to know
The training should start by making the child observe his elders. One must incorporate a calm environment at home so that the kid can learn the same. Whenever the child does something wrong, don’t scold or shout but correct him in a low and soft tone. Teach him to never give up. If the kid fails to perform any activity then boost his confidence. Motivate him to try patiently until he succeeds.
It can be any activity like drawing, painting, learning etc. When the kid grows aggressive or acts weirdly, tell him to calm down and make him learn about the negative effects of such behaviour.