I can list limited characteristics of bad Best SEO Backlinks, look into links you are getting and find following characteristics:


It's On A Low-Authority Or Questionable Domain

It's Pointing To A Source Irrelevant To Its Content

It's Repeated Too Many Times On The Domain

It's A Part Of A Reciprocal Exchange

It's Embedded In Suspiciously Keyword-Matched Anchor Text

It's Isolated From Any Meaningful Content

It's A Part Of A Scheme

You can check bad backlinks before building them and later on you can identify them by any tool.