#1 H1 & H2
Your H1 and H2 should contain your primary keywords/phrases - while this won’t automatically help ranking, it will help the user, and search engines, better understand your content. On your cover page, this is your title and subheading. Each Chapter Page has a H2 (heading) and H3 (subheading).
#2 Your slug
Your slug is the information that comes after your domain extension in your URL. Adding appropriate keywords is not only a ranking factor, but also aids UX and ultimately will boost SEO. This can be setup easily in Doc settings.
#3 Your Doc description
We recommend including your focus keywords here, as this will appear on social cards and also serve as the meta description on the SERP.