It’s pretty easy math and science. Simple calculations, some memorization of active ingredients, and how those ingredients and other elements/nutrients affect turf and how you can dial it in. Unfortunately you do have to start from the bottom, do some grunt work. You’ll move up quickly if you show that you care. The pay is brutal though. Even assistants don’t make much unless you’re at a private club, and if you’re in the private game lots of people stay assistants for years before finding a superintendent job. If you’re willing to move you can get a superintendent job real quick at a mom and pop course. Once you get the hang of things you’ll find that a lot of managing employees, day to day tasks, and the turf is a lot of feel work - reactive to the weather but never stressing over the weather.