Think about mutual like playing on a seesaw. When you sit on one side, your friend sits on the other. You both need to push your feet to make the seesaw go up and down. If only one of you pushes, the seesaw won’t work right. Mutual means both people are doing something together, just like you and your friend making the seesaw move.
Another way to see mutual is like sharing a big cookie with a friend. You both take a piece and enjoy it together. It’s not just one person eating the whole cookie. Mutual means sharing and enjoying something together, so both of you are happy.
Imagine you and your friend are drawing a picture together. You both pick up crayons and start coloring. You might color the sky while your friend colors the grass. You’re both working on the same picture, and it looks beautiful because you did it mutually. Mutual is when you both do something together, helping and sharing to make something nice.