Learn to build a robust authentication system for Next.js applications using Clerk in this comprehensive 50-minute tutorial. Explore the process of setting up Clerk, implementing a Clerk Provider, creating a header component, and protecting pages with middleware. Discover how to create sign-in pages, add conditional header links, and integrate UserButton and UserProfile components. Dive into email signup and verification, theme customization, and building a custom sign-up flow with form UI. Master handling form submissions and email verification to create a secure and user-friendly authentication system for your Next.js projects.