SEO Backlinks

do not search for sites providing free or paid backlinks. google loves normal and real backlinks and will pay less attention to these type of backlinks.
 
look for guest post writing opportunities or seek them out and offer your expertise to blog websites specific to your industry and have them link back to your site. Google will pick up on the relevancy factors and your pages will reap the rewards.
 
Be aware that the Domain Authority numbers were reconfigured/recalculated here just recently (Feb 2019?). So you're going to find a bunch of people offering DA's on different forums.

Spending the money on high DA's is not worth the effort. All you really need to do is audit your website, determine your DA/TF (if you wanted) and then aquire links for anyone that is above your numbers.

Getting a DA 60 to link to your site when you have a DA2 doesn't do any good. If you must follow arbitrary numbers, you should be stepping up in 5-10 DA incriments.

All that said, with our SEO clients, we don't use DA at all in our reach out campaigns. We strictly look for links related in the industry and then contact those sites with content etc. Blinding purchasing DA links does have an instant effect, but the results are hard to sustain.
 
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