With a static website, you use different sized headers to indicate sections of each page - and how important each section may be. That helps your readers search each page, and makes them happy - and making your readers happy increases SEO. With a Blogger blog, what makes your readers happy increases SEO, also. With a blog, you make your readers happy by providing content, for them to read . And you make them happier, by organising the content.
What Blogger won't tell you