There are dedicated sub-forums here for Chase, Citi, and AMEX, in addition to the one where this was posted for basically all other credit cards. There are threads in each with important info that you'll want to digest to learn the known rules and best practices (which are often in flux so keep coming back to remain informed).

Doctor of Credit website has a good collection of info about most of the major card issuers, lessons learned, etc. That would be another good source for education.

https://www.doctorofcredit.com/