Sites that buy and sell links

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Sites that violate Google guidelines
Backlinks from link collection sites
Backlinks from copied content
A large number of inbound links from one site
Backlinks from sites that have been penalized by search engines
Measures to avoid penalties
If you leave low-quality backlinks unattended, you may be penalized by Google. In communication directors mailing lead order to avoid penalties, it is important to use Google Search Console to check for low-quality backlinks to your site and set them to be disavowed.

Check for nofollow links
Links with the nofollow attribute set will not be effective in terms of SEO. Ask the operator of the linked site to remove the nofollow setting.

Avoid Unnatural Link Building
Unnatural link building, such as using the same anchor text extensively or buying links, may result in a Google penalty. Focus on creating quality content so that you can gain links in a natural way.