Google says linking to other websites is a great way to provide value to your users
External linking is also a good idea whenever you want to cite information from elsewhere on the web, or send the reader to an authoritative third-party source of information.
We do this all the time on the Ahrefs blog:

Over time, some of your external links will break as the linked page is redirected or deleted, creating a bad user experience. You can find and fix these broken links using Site Audit: just set up a regular crawl of your website, and monitor the Pages with broken links issue in your crawls.

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