Registering in the Reddy Anna book is important for multiple reasons. First, it provides users with a legitimate identity in the betting or gaming network. This identity ensures their activities are properly logged, reducing the risk of losing track of bets or funds. Second, it enables smooth and fast communication with book admins. Lastly, it creates a safer environment by minimizing fraud and ensuring that only verified players are involved. Being registered means you're part of a trusted system with rules and oversight.