Geared toward industry professionals but useful, no doubt, to anyone who eats, drinks, or (especially) entertains.
Learn how to decant, how to perform proper Champagne service, how to pour a beer (from tap, bottle, or can), what glass to use when (and why), cleaning, rinsing, polishing, and giving good recommendations to your guests (be they patrons to your establishment, or your spouse's visiting relatives).
Know better. Be better.