Some of the things that really helped me out over the years...
- What are some low-cost solutions for greatly improving your beer?
- Brewing water, salts, and pH during the mash. How important are they? How do I get (and read) a water report?
- Alternative techniques to brewing. Brew in a Bag, No Chill, Etc.
- Fermentation. Is it possible to lager without a refrigerator? How important is temperature control? How long is too long in primary?
- To do or not to do--what have you learned NOT to do? Failed experiments, etc.