Any SEO expert would caution you to be careful with your website’s backlinks especially since search engines nowadays give heavy penalties to those who don’t. Google, for example, is in the habit of manually removing low quality sites from their index. What does this mean for sites linked to them? They suffer a decline in rankings.
Low Quality Links
Low quality links are what search engines dub as “overoptimized” or use spammy tactics like keyword stuffing. These sites are often made just to trick search engines, and not for real human readers. Since Google now prioritize user experience above all else, your website can get penalized for not following guidelines. This, in turn, will lead internet users to believe that your website is not trustworthy.
There are many ways to tell if a site can be considered low quality. Aside from spamming, low quality links tend to also have and overabundance of ads.
Google takes backlinks seriously. To warn websites that they may have unnatural links, they send out warnings informing site owners to make the necessary changes. Google may also see it fit to take further action if you don’t resolve the issue right away. The easiest way to prevent such thing from happening, of course, is remove the links. If you are unable to remove the link, disavowing them is also an option. Basically, Google will do the work for you after you download a list of links to your site and send the ones you want to be removed to them.
Still, the best way to avoid penalties for low quality links is to be meticulous with your backlinking practices. Conduct a backlinks risk assessment beforehand. SEO companies and professionals can help you in this regard since this can be an arduous task.
How to Check Which Links Can Harm Your Site’s Rankings , moz.com