Crypto Book Recommendations?

I think we can all agree youtube has become infested with an overabundance of content from creators who care more about pumping and dumping their own investments and internet fame as opposed to HELPING their subscribers. Im looking for free ebook downloads in hopes of finding better material for trading and mining. Found this link _ +20 Free Cryptocurrency Books [PDF] |

But wondering if anyone has recommendations for downloads or purchase on books that helped them… cheers!