You could watch PBS until you were senile enough to actually participate in a pledge drive, and you still wouldn't have a comprehensive grasp of the whole of human knowledge. Screw it: cling to little nuggets of pat wisdom, at RulesOfThumb.org.
ROT's a storehouse of 3500+ proverbs/truisms/oft-dubious tips from 151 categories, all compiled from 1) Rules of Thumb, the book, 2) user submissions, and 3) Urban Legend star Pacey from Dawson's Creek. Rules are vetted by users, who assign each advicelet a 1-to-10 "thumb" rating, letting a quick glance determine if a suggestion's beneficial, or just something some farmer came up with. The advice ranges from wiseass (Don't buy a car with a horsepower greater than your IQ), to better-be-true (If an assailant is actually touching you with a handgun, you can knock it out of line before he or she can fire it), to absolutely crucial (Rectangular servings of strawberry shortcake sell better than round servings).