Advice on difficult to judge things like how to sauté onions correctly without burning them; how to deal with yeast (what does it mean when your bread is hollow? What about when it’s hard? Doesn’t rise?); how to make a cheese sauce that isn’t too thick, thin, or chunky; techniques for timing stuff to be ready at the right time (ie ‘cook the eggs last’); balancing things with lemon juice (in general the stuff about balancing acids); seasoning soups so they’re not bland.