They do it a lot. That's how they learn. Whether it's fixing cars, writing programs or installing electrical wires. When you do something a lot. You quickly bec

They do it a lot. That's how they learn. Whether it's fixing cars, writing programs or installing electrical wires. When you do something a lot. You quickly become an expert at it. When you do something a lot and you also study the subject (whether at university or self-taught) you'll really understand why how you do stuff matters. Whether it's picking the correct data structure for your program or deciding what material to use to repair a damaged wall. You'll be a true expert that people rely on and trust. And, they'll pay for that expertise.