You are going to have to be more specific with your question. If you want to get started in mentalism, I would recommend to read Artful mentalism volume 2: fundamentals (bob Cassidy) PME and or The Jinx by Annemann, and 13 Steps. These are essential to any mentalist. After reading these books, you should have a solid understanding of what mentalism is, how to perform it, and solid material comprised of billet work, book tests, cards, Envelope work, and blindfolds. If you want, then you can get into Peter Turners work, and more powerful things like dual reality. Let me know if this helps.