What you wrote is my takeaway from the article as well. There's an expression "if you can't do, teach!" which can be interpreted in different ways, but I would

What you wrote is my takeaway from the article as well. There's an expression "if you can't do, teach!" which can be interpreted in different ways, but I would say it means you get much better at something when you are forced to write, re-read/interpret and explain it.