Content optimization is very important aspect in Web promotion. Well optimized content always drives your web site into top position in Search engines. Always your content should look informative and targeted.Best content optimization method is collecting the more detail information about your products.
Yes that's right you should use variations of your keywords, content should be unique & quality. And don't stuff unwanted keywords in the content.
In term of ranking 1st in google, i believe each page/content have the same weight to be rank. Well said, we need to optimized every content that we have if we want to increase our possibility to rank higher in SE.