First off Cardistry is NOT Magic, and Magic is NOT Cardistry. I don't care what anyone else tells you Cardistry is nothing more than a visually appealing, self gratifying, manual demonstration of magical masturbation; done because it makes the performer feel good and no one else.
That isn't to say that Cardistry ISN'T a talent mind you. I humbly take my hat off to ANYONE who can juggle a deck of cards the way people like a lot of these kids do you see on youtube. It takes hours upon hours of practice to master that s***, and frankly it's just not something I have the time and patience personally to invest. Perhaps I'm jaded, jealous, and cynical? I've been accused of being worse.
What Cardistry is, theatrically, is a demonstration of the Ego. What it says is "Oh look at what I can do that you can not." There is no mystery, no story, and no wonder. It maybe at best capable of being elevated to the level of puzzle, but it will never be magic.
I feel like an old geezer saying this, and I shouldn't because I'm still a young pup myself, but back in the day what "Cardistry" used to be called was "flourishing". Flourishes were little connector pieces used during a card routine to spice up the action and assert to the audience without saying as much overtly that the card handler was an unparalleled pro and thus complemented his talent as a magician in the overall presentation. Somewhere down the line Devo got a hold of it, and created a lot of different "advanced" moves that looked beautiful but were hard to master. Kenner came out with the Wurm, and then this new underground movement of card-icians started to form. This movement eventually settled on the term "cardistry" and soon every 14 year old on the block was doing it. Yes Cardistry can incorporate different sleights within the body of it, but in and of itself, it is NOT magic.
Thus being all said, if you are looking to start learning card magic I highly suggest you look at Eardnese, Royal Road, or maybe even Card College. I can't make any suggestions for cardistry though, as I don't do it myself.
I know this next line from me will be HOTLY debated, so I'll put it in bold now, but it's something I stand behind from a performance theory point of view:
"Cardistry will never be anything more than a demonstration of pure ego. It maybe art, but you can only stomach someone's ego so long before you have to go somewhere with it, and more juggling isn't the solution."