You don't weigh your ingredients. I cannot stress enough how important it is to weigh out all of your ingredients (all ahead of time, if you really want to bake like a pastry chef) on a digital scale. One cup of feathers does NOT weigh the same as one cup of pebbles, ya know? It's so easy to find volume to mass conversions online, and your baked goods will not only turn out better, but they will be more consistent.
I'm happy you got that passive/aggressive thought off your mind.. Cook on, big fella.
#6 Grocery store chills some vegetables but not others, I do what they do.
#9 Mix sauces similar to mixing paint; alternate top to bottom and outside edge inward.
#12 An accurate meat thermometer is a crucial tool. Learned my lesson after I overcooked a good piece of meat.