SEO tags

1. sitemap.xml
2. application/ld+json
3. ico
4. keywords
5. description
6. robots
7. og
   1. type
   2. title
   3. description
   4. image
   5. url
8. twitter
   1. site
   2. card
   3. title
   4. description
   5. image
   6. url
9. canonical
10. alternate