What are the guidelines need to be followed to write the SEO?

SEO uses the cross linking between the two sites that is having other functionalities as follows:

This allows the site to be unique and having the original content and the site is being evaluated on the basis of the content.

Use of different IP address can work out as well as use of crawlers that doesn’t get penalized for cross linking.

Cross linking is not used on every page as it fills the page with other links and puts the link on the same websites using the page.

Anchor text is used in the cross linking that provides rich keywords and in good length used by the search engine crawlers.

Link ring shouldn’t be created on sites as search engines will penalize the cross linking of the websites.