firewall: filter rules and nat

RouterOS Beginner Basics
1

Please someone can tell me wich main rules i have to insert in firewall filter rules and firewall nat ???

p.s.
i use hotspot server

2

Vague request.

While setting up your hotspot server, if you use the setup wizard it will automatically add relevant nat (masquerade) entry. If so, you don’t need to play around with nat. Read more about nat:
http://www.mikrotik.com/testdocs/ros/3.0/qos/nat_menu.html

There are a host of firewall filter rules you may want to implement. It depends on how much protection you want to provide for your router and your customers. Read through the wiki articles in this link and adjust the rules to suite your needs:
http://wiki.mikrotik.com/wiki/Firewall