This looks like a super interesting book. Masters of Doom really captured my imagination when I was young and is probably the #1 reason I'm in programming today

This looks like a super interesting book. Masters of Doom really captured my imagination when I was young and is probably the #1 reason I'm in programming today. Does this book have anything "actionable" or is it more an historical overview of the Wolfenstein engine? Will I have the knowledge to implement a similar engine afterwards? (Probably will get it either way, though)