I have a certain strategy for doing research, finding sources, and checking facts when it comes to questions dealing with Catholicism. I've given this strategy below as an answer. I've found it to be pretty effective for finding good, reliable material.
(In my answer I've avoided giving links, or mentioning specific sites, except those that are official (like vatican.va). This isn't about listing denomination-advocacy sites that "everyone should read", in case anyone was wondering.)
For other denominations... I have no good idea. What should I do? What do you do?
Are there particular places/works that people should be seeking out, particular steps that people can just follow in order to answer the majority of standard questions?