As far as I know, generally speaking doing things yourself, is what makes learn how to do them. So if you don't play with firewall rules, block yourself a coup

As far as I know, generally speaking doing things yourself, is what makes learn how to do them. So if you don't play with firewall rules, block yourself a couple of times, do something stupid you'll never learn. I could argue that doing copy-paste firewall rules from the internet might not be a good thing. Will give you the idea of security while there might be none.