What are the best sites for beginners to team up and get into CTF's?

Question

Inspired by youtubers like John Hammond, I'm trying to get into CTF's leading to my question. What are the best sites for beginners to team up and get into CTF's?

Answer 1

May be w3 schools

Answer 2

What do you precisly mean?

Answer 3

The tutorial and other stuff school

Answer 4

I get that, but it won't allow me to interact with others.

Answer 5

Thanks for the reply though.