Online Community of Zenith Builders and Flyers
Although there is no specific Tips & Tricks section, the whole site is basically a collection of tips & tricks. Just go to the relevant aircraft type and search the topic you are wondering about and you are sure to find many suggestions as to how builders have undertaken those aspects of their builds.
I agree with Efe - search for tips and topics of interest on the type-specific forums if you're looking for information only applicable to your specific Zenith type. Otherwise, search the Open Forum for topics/tips of general interest to all builders, and search the specific Engine Forum for information on your engine.