Apache HTTP Server 2.4 Reference Manual 1/3

It is actually my friend who is using this, and was for him & his non-stop server & website work which he does when I purchased it.According to him, this manual is more than 70% identical to the documentation found online, but the other 30% is invaluable, clearing up rather vague issues, showing numerous real-world examples of specific module configurations, etc. And it furthermore contains step-by-step sections on troubleshooting known areas of issue, which he said has allowed him to fix things which have been plaguing him for months. While he says it continues to have areas which leave you saying "Umm... That's it?!" and has an indiscernible sentence here & there, he had summed up his feelings about  Apache HTTP Server 2.4 Reference Manual 1/3 (Volume 1)  by saying that his main HTTPD 2.4.X Server had a Public TTFB of ~400ms before cracking into this book, and now the TTFB is consistently below 190ms while using less resources & handling 2x as much traffic as before!! I only understand about half of that, but it is truly the most excited he's been about a book that I've ever seen.