Very basic
This is a quick read, but doesn’t provide much more information than what you can get from a website. It’s highly anecdotal and is more a list of things the author learned as a PA. Not a bad read if you’re really green and prefer books over websites, but not really worth the money.
The author also tells about advice he got that if he wants to be a director he should just direct. Which, on its own is not bad advice, but in the context it basically tells people if they want to be a director they shouldn’t bother being a PA.