It is very important to pay close attention to everything that you do in order to drive a lot of visitors to your site and improve ranking. If you overdo any SEO technique, it will lead to SEO overkill or overoptimization, and your site will be penalized by search engines.
This is all about the use of different techniques that are considered unethical, also called black hat SEO. These techniques are done to drive more visitors to the site and improve ranking more quickly.
Here are some common black hat SEO techniques that lead to overkill: