I'll try to give you a practical example.
Trying to get a really good sear on round steak cut up into chunks.
Things:
Cubed round steak.
Cast Iron Skillet.
Olive Oil.
I've tried this numerous times and it took me a long time to get it right. The meat eventually goes into a Stroganoff (get stewed then turned into a gravy.) But you want a nice sear on the meat, that nice browning on it, that caramelized beef.
Turns out it's harder to do right than you might think. Do you put some oil in the pan, then heat it up to medium before throwing the meat on? No, because it's not hot enough to really sear the meat quickly. Why do you need to sear the meat quickly? Because as it heats up the fat comes out of the meat, and instead of the meat sitting on a hot iron skillet, it's floating in fat and juices. That's why you also can't use too much oil, otherwise you end up frying the meat instead of searing it.
So, you heat the pan with a little bit of oil and get it nice and hot. Toss the meat in. Then you stir it generously, right? To get the meat coated in the oil and prevent it from sticking, right? Wrong! If the meat is just briefly touching the hot skillet, it's not getting that blast of heat that quickly caramelizes it. And then the fat runs out and again, you're not searing.
Then you just put the meat in it and let it sit for a while? Not quite. Then the meat gets really stuck to the pan, and scrapping it off loses you that layer of browned meat that's now stuck to the pan.
So, you toss it in, let it sit for 10 seconds, stir it once, let it sit for 10 seconds, ect...until the fats and juices start coming out. And you end up with nice seared corners and faces of meat.
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All of that is a product of study. Knowing your tools, knowing your product, knowing the process, knowing what you want out of it. It's comes from practice, observation, guesswork and failure. Go google a youtube clip from Casino where they're talking about how much of a pro Robert De Niro's character is. How much he pays attention to, how much he makes it his business to know. That level of detail and understanding all the factors at work is what cooking is about.