There are free forum software options that you can install on your own web space, e.g.

>> https://www.simplemachines.org/

Or you can use a forum service provider that takes care of everything. However, these almost always cost money and are often expensive.

Hello

by the past I used this one : phpBB

https://www.phpbb-fr.com/

probably the best known solution

interface well known and FREE

hope this helps

Axel