This guide provides instructions for building a secure, functional sign-up form using Next.js App Router along with technologies like Argon2 for password hashing, Drizzle for ORM, Zod for schema validation, and React Hook Form for client-side form management. The sign-up form features dynamic form validation, password strength feedback, and secure password storage. The guide emphasizes the importance of both client-side and server-side validation to ensure security and enhance user experience, using Zod to maintain a consistent validation schema across both layers. The server-side process includes hashing passwords with Argon2 to prevent security vulnerabilities and validating data to avoid malicious entries. While the guide focuses on building a basic form, it suggests advanced features such as social sign-in options, biometric authentication, and email verification for production-level applications. For those seeking comprehensive user management and authentication solutions, the guide recommends exploring platforms like Clerk, which offer advanced features and an easy setup through component-driven APIs.