The Content Editor is the place you enter text, images and other assets that will be viewable on the page. There are some unique things but for the most part it operates a lot like a word processor. One important thing to remember is that the title of the page should have an H1 tag applied to it. Use the Page Name for the title to increase consistency. Add a subtitle if you need more words to describe the content of the page.
Why Is This Important?
Search engines use the H1 designation to help determine what the page is about and what is most important about the page. Carefully chosen titles with H1 applied may help the page's search engine ranking.