Poor content with little to no added value

[sharminakter]

Keyword stuffing
Unnatural links (both to and from your site)
Different types of spam
You can check if you've been manually actioned in Google Search Console.

In the left sidebar menu you will find a section "Security and manual actions" and, within it, the link "Manual actions".

Click on it and you will arrive at a page where you will find the progress of the action.

If all goes well, you will see a green check mark indicating that no issues were detected.

Manual action in Google Search Console
If your site is subject to a manual action, you should resolve the issues and submit a reconsideration request. For more information, see Google's Manual Actions Report guide .

For example, if you have been subject to manual action as a belgium telegram number database result of purchasing backlinks ("Unnatural links to your site"), you must get rid of these backlinks, either by contacting the webmasters or by disavowing them .

For more information :

What is a Google penalty?
Google Manual Penalty Study: Detecting and Managing Artificial Inbound Links
5. Check for Mobile Usability Issues
We live in a mobile-first world, and if your site isn't mobile-friendly, chances are you're not prioritizing user experience.