One of the important information to get a top Rank from Google is to keep the user friendly keyword to identify your site or page of the site. Do not keep duplicate title; it will be difficult to get the page in search engine.
Keyword density is one of the important aspects for the search engine. How many use friendly keywords or easily searchable keyword makes your site to top rank.
That is why Tony is insisting us to include good keywords like easily identifiable keywords to increase the keyword density.
If you enter a keyword like "How to" then it will list number of options to you.