Seeking "Tips of the Trade" for General Improvement of Knowledge

Many thanks in advance for "tips of the trade" you can share with regard to Microsoft Excel. I've dabbled enough to keep basic lists and budgets but I would like to be proficient in this system including the mastery of formulas and advanced database creation. I'm looking forward to being active in this savvy community and, perhaps, one day I can be a resource to other Excel "Knowledge Seekers". Cheers! G