Build My First AI SaaS MVP

Guide me, a beginner, through building my first AI SaaS MVP. Use Next.js, TypeScript and Tailwind CSS with a real database. Explain the difference between the browser, server, database and AI provider.

Build a landing page, secure email/password authentication, onboarding, dashboard, AI interface, conversation history, settings, pricing and usage-limit surfaces. Define a clean API architecture, database models and server-side AI request flow. AI provider keys must never reach the browser. Add authorization, input validation, rate-limit considerations, error/loading states, privacy messaging, SEO and deployment instructions. Separate MUST HAVE MVP work from later enhancements. Use Next.js with TypeScript and Tailwind CSS. Build a polished, accessible, responsive application with clear beginner explanations, reusable components, semantic HTML, loading/error/empty states, form validation, SEO metadata, dark/light mode and deployment instructions. Explain important decisions as you go.