The essential thing is to learn and understand the basic principles. This is where the books come in, to learn the basics. One book may show pictures of a particular machine, but it works according to the same principles as most other lathes, The details become apparent as skills develop.
You learn to fasten a belt before running, otherwise your trousers tend to fall down, and you fall over, and are embarrassed, if not actually injured.!. .
The detail is knowing what does what on the machine that you actually have. (On one make of machine "up" may do one thing, on another make it may do the reverse, or something completely different. )
This is where being familiar with the machine comes in.. But first things first.
Two of the first things that I first learned were that putting on a cut removed the same amount of metal from the other side as well, so the diameter decreased by twice as much as I expected.
The next thing was learning how to turn a handwheel consistently, with one hand taking over from the other, to produce a consistent feed rate..
Learning the effects of changing the feed rate become apparent as you learn how to feed steadily.
My instructor then taught me how to grind a tool and to set it on centre height.
Becoming expert in setting up changewheels for screwcutting or power feeds can wait until you have a better understanding of what the machine does, how it does it, and how you operate it.
Once these basic skills have been mastered, you can extend the boundaries of your knowledge.
Take the time to learn, the clever stuff comes afterwards!
Howard