Keywords for SEO
Search engines work by keywords; the words that people type in the search field.
While you can technically set keywords for your page, every major search engine ignores those today, because people would obviously try to game them. Instead the search engines analyzes all the text on your site and extracts interesting keywords.
It defines interesting as a word that is both on your page, in the domain and if some other site uses that word with a link to your site (and people click it).
So there isn't so much you can do here, other than write really great content that uses the keywords you want to be ranked for. There are many tools and materials that can help you with this.