The Altium Designer program has a very large set of rules that a person can specify for the PCB design process. So far I have not been able to find any type of "standard" rules file that I can import into the program. How does one know what rules to specify in the program? There are quite a LOT of rules to be specified in there. Also, if I am tampering with the rules, how can I put them back to the value that they were when I installed the program?