Everything you need to answer your questions
KeywordsKeywords that can be set up in your website content even though they are a valid attribute for indexing no longer have the value they had in the past being even suppressed by the major search engines.
See this article to learn more about this.
At this time the search engines give real value to the content of your website. In order to achieve better indexing in the engines, you must place the keywords/meta tags/phrases you would like to find throughout the content of your website, organized in a logical and hierarchical way. Check out our "Your Site and Search Engines" section for a few tips.