How to do SEO for SINGLE page Website ? Are there any SEO guidelines for "one page websites"?
Are you referring to static sites?
See here is the fact SEO stand the same for every site. Do some on-page work then focus on building quality backlinks.
You can do it, but very carefully, You have to use fully white hat seo technique.
Some of the good on page factors are:
Keyword research
Meta tags and title
Meta description
Robots.txt file
Sitemap generation
Content development
Image optimization
You can do it seo of single page website, but be very carefully about google recent algorithm updates.
on-page seo techniques are
1.Page title.
2.Meta Description.
3.Meta tags.
4.Head tags ( H1, H2.... ).
5.Internal links.
Website Title, Meta description, Header tags, keywords and content optimization, business analyze proper call to action, and navigation of website, Sitemap, robots.txt, website loading speed.