Why must I wrap my app in a BrowserRouter?
Because the router enables routing throughout the app and connects React Router to the browser history. Without it, Routes and Links do not work, because there is no router context to manage the URL.
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More FAQs in How to Set Up React Router in Your React App From Scratch
Install react-router-dom, wrap your app in a BrowserRouter, define Routes that map paths to components, use Link for navigation instead of anchor tags, add a catch-all 404 route, and use nested routes with an Outlet for shared layouts.
Because Link updates the URL without a full page reload, which is what makes client-side routing work. Plain anchor tags trigger a full reload, which breaks the single-page experience and loses your app state.
Add a catch-all route at the end of your Routes that renders a not-found component when no other path matches. This handles invalid URLs gracefully instead of showing a blank page.
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