Build My First Data Analytics Dashboard

Help me build my first professional data analytics dashboard as a beginner. Use Next.js, TypeScript and Tailwind CSS. Start by defining a small realistic dataset and explain its fields.

Create KPI cards, charts, tables, filters, search, sorting and date filtering. Explain every calculation, aggregation, chart choice and how to avoid misleading visualizations. Add a clean data-access boundary so the dataset can later come from an API or database, plus export architecture, responsive layout, accessible chart alternatives, loading, empty and error states. Include a deployment and testing checklist. 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.