Linking to complementary information on other non-competing websites is a good practice, especially if the links point to authority sites with good content. Users reading your content will click on these hyperlinks instead of navigating back to Google to find more complete information. Also, Googlebot will detect links to good authority sites and might attribute your content as good quality as well.

Think of links within your content like footnotes in a research article. When readers see references to other trusted sources, it adds credibility to the content on your site’s pages.