How should I structure my website?

Someone said on a YouTube video that you should structure websites with your keywords going from broad to targeted.
Example:
Front/Home Page
-High competition, broad keywords
Product Pages
– Low competition, targeted keywords.
Using at least 3 keywords per each page.

Do you agree with this information? Instead of having all targeted and low competition keywords on your page, is this is a good idea?

See original post by Scott Bradley