Nextjs Guideline: Link — Use next/link for navigation. Description: Client-side navigation with prefetching. Do: <Link href=""> for internal links. Don't: <a> for internal navigation. Good Example: <Link href="/about">About</Link>. Bad Example: <a href="/about">About</a>. Severity: High. Docs: https://nextjs.org/docs/app/api-reference/components/link.