What is grey hat SEO?
The Grey Hat SEO is a middle way between White Hat SEO and Black Hat SEO. It is riskier than White Hat SEO, but not blatantly bad as Black Hat SEO. It is a practice used to improve site’s ranking.
Redesign the content of the website. Allow anyone to write a comment on your website. Make news websites. Write about a small charity and put there a link to a donation page. There are many techniques of Grey Hat SEO. This practice can be classified as good one year and as bad the next.