The best way for domain authority is to back-link on sites that have a higher authority than yours. Basically Google Crawlers tend to determine the legitimacy of sites based on which authoritative sites interact (or promote) with yours. This is a very simplified answer, but there is a lot more to domain authority than just this. Outbound linking, and Inbound linking are a great way to get started. There are fantastic ebooks, PDFs and infographs on this subject.
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