Online games

[DMTooth]

What are the best/safe online games for kids to play with their friends ?
I am interested in range of 5 to 7 years, preferably with an educational element, that will allow kids to play remotely with their friends.

Club Penguin?

Nowadays kids of 5 years old are much smarter than me when I was 10 years old. My boy of 7 years old is playing Rocket League, it's not only a cool game but also it helps him to integrate into society because it's online. You can recommend your child to play it, it's football, but with cars. I have even seen my boy trying to make rl trading, and he even succeeded to make some money. I was shocked. How can a 7-year-old boy make money online by trading skins in a game?