There are many people who like to read books on car tuning. You should definitely consider buying one of them if you want to improve your knowledge about car tuning. It is true that many of them are plagiarized and just rewrite the same thing but in different words. But there are some good books out there that actually teach you something new. However, it is very important to check books for bad plagiarism, so as not to make your car worse because of wrong advice from the author. There are a lot of good services, I use
https://fixgerald.com/ . Many books on car tuning are written by authors who have no idea how to do any of the things they are talking about. They just read the same thing in different words, then take credit for it. I am a beginner so I can't recommend anything, but I think that almost any book is worth read.