
The Royal Road to Card Magic is much shorter, much cheaper, and also a classic.
But yes, I follow a few YouTube channels that have taught me a lot: Xavier Spade, Alex Pandrea, PigCake and a few others. There are some excellent ones, but I noticed that you do have to be careful, there's a lot of "reveals" or "tutorials" that are done by hobbyists and their quality is varied, some would teach bad handling or bad habits. They can be fine to get the concept, but maybe not as an absolute beginner. The ones done by magicians who perform professionally tend to be great quality though. But you probably know this better than I, since it sounds like you've been doing it longer :)
Its really easy to find tutorials and guides nowadays, you just gotta put the time in!
I personally don’t actually like the double lift because I find that 90% of them, even though they are perfectly executed, just don’t look natural — most laypeople simply would never turn cards over in the way most magicians do and it just looks fishy. Having said that, most laypeople don’t actually notice (it’s ibcredible what you can get away with sometimes!) but I notice it and it puts me off :)
[1] A side story on this book... I may have cost the publisher a bit of money... They have a "video edition" of the book, where many of the techniques and routines have a QR code linking to a video, but when I got it, all of the links were broken. So I complained to the Advertising Standards Authority (UK) and about two months later, all of the QR codes started working. I noticed that they all directly linked to Rackspace CDN URLs (ie not to their own domain). I can't imagine it was fun or cheap to get the exact same identical URLs working again...
Often, I compare magic to programming. It’s all about the “effect” and wowing people with something they did not believe possible. But software, as with a trick, loses its effect once you see it the second time. And, once you get into the details of how the sausage is made, it’s technical, time-consuming and probably not worth it for most people who just enjoy the effect.
There’s a book “The Royal Road to Card Magic” and there’s a line there which says (paraphrasing) “there is much joy in being the deceiver as there is in being deceived” - perhaps that’s where the joy is to be found, as at the other side of that transaction rather than “enjoying being deceived”?
And as others have mentioned, if you do go to Erdnase (or get sufficiently hooked to just want a copy), there is both the Annotated Erdnase by Darwin Ortiz (which is pretty readily available), as well as Dai Vernon's Revelation book (not to be confused with the 'Revelations' series of DVDs), his own annotations on Erdnase ( http://www.mcmagicwords.com/books_revelation.html ).
