I’d just sit down with a deck of cards and find ways to handle them gracefully. How can you smoothly spread a deck between your hands? How can you smoothly take on card out of the deck? How can you smoothly cut the deck? Forget online tutorials or books at the beginning. By taking time to experiment with what works for you, not only do you strengthen your own personal understanding of cards, but you also have a more deep and intimate relationship with the deck of cards. It’s not just something that uses an instruction manual, it’s something to explore, and to interact with.