Hence the advice to get to know how they work.

Setting a port means where it asks you which port that you fill it in with a number. Why 80 and 443 is because those are the ones the internet is using to connect with you. They could be any number, so their meaning is irrelevant at this point, but it's necessary to block the connection at the right port obviously.

Pre filters:
(Example for pre filter)
Address: 192.168.2.2
Port: 80

Post filters:
Address: 192.*.*.*
Port: 80
Address: 192.*.*.*
Port: 443

I'm not an expert, just trying to help.