Avoid the inconsistent results most home cooks experience

Chefs aren't surprised at the results of their cooking, they anticipate excellent results and use the methods to assure them time and time again.

Recognize the EFFECTS of heat on food

Chefs don't watch a clock. They don't cook by TIME and oven temperature.  There are too many variables.
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Create flavor profiles using herbs and spices

Chefs are skillful at putting their final finishing touches on a dish, they understand the difference between herbs and spices, and are confident in when to use each.