Comment by Tamklomo

The reason is, that using hashcat is not complicated for people who have linux experience and the amount of people wanting to crack a password is probably not that high.

Otherwise you do find plenty of people on YT walking you through hashcat. The first YT Video alone has 7 Million views: "how to HACK a password // password cracking with Kali Linux and HashCat"

I wish him luck, great drive to do this, i hope it works out well enough, books are just in general not easy to sell.