There is a distinct difference between editing a site for search engines and making edits for visitors. Traditionally in SEO, adding keywords to a web page falls under the category of editing for search engines. But many don’t realize that adding keywords to your copy can and should be a function of making the site function better for visitors.
The copy of your website falls very distinctly into the marketing realm of website management. Yes, search engines look at copy too, and adding certain keywords can help you achieve search engine rankings rankings, but each page needs to appeal to your readers first.