What walls can I use to defend my base?

[JustJosef]

I have cobble and obby but I see that regens aren't allowed.

Also what is the green area on the /f map around my base?

 

[Yanique1]

I have cobble and obby but I see that regens aren't allowed.

Walls such as anvils or torches etc that don’t let tnt blow up are not allowed.

Also what is the green area on the /f map around my base?

On the map you will have purple claims green claims and orange claims.

Purple claims mean any spanwers located in those chunks will be counted toward your faction value. Green is just normal claims and orange are claims used for raiding.