Installation methods:

1. CDN (development only): <link href="https://cdn.tailwindcss.com" rel="stylesheet">
2. npm/yarn: npm install tailwindcss
3. PostCSS plugin: Most common for production
4. Standalone CLI: tailwindcss binary
5. Framework integrations: Next.js, Nuxt, Laravel Mix, etc.

The PostCSS plugin approach is recommended for production as it allows customization and purging.