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• Access logs: /var/log/apache2/access.log
• Error logs: /var/log/apache2/error.log

You can view the logs using the cat or tail command:

If there are no errors, Certbot is successfully configured to automatically renew your certificates before they expire.

If you want to ensure the strongest security for your SSL configuration, you can edit your Nginx configuration file. Open it with a text editor:

add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

Prevent large payloads from overwhelming your server by setting a limit on the size of client requests.

Open manifest.json and add the following content:

{
  "name": "My Progressive Web App",
  "short_name": "MyPWA",
  "start_url": "/index.html",
  "display": "standalone",
  "background_color": "#ffffff",
  "theme_color": "#4a90e2",
  "icons": [
    {
      "src": "images/icon-192x192.png",
      "sizes": "192x192",
      "type": "image/png"
    },
    {
      "src": "images/icon-512x512.png",
      "sizes": "512x512",
      "type": "image/png"
    }
  ]
}