Authoritative Resource In other words, we must select external chain resources with a relatively high degree of authority to build the external link chain. Extensive link chains That is, the resources of our external link chain, should be distributed as widely as possible, across multiple channels and multiple types. Correlation That is, the resources that we publish in the external chain should have a relatively high correlation with our business. If you're an auto parts manufacturer, don't go to the food forum to post external links. Indexing acceleration That is, at an early stage we planned how many external links are needed to squeeze the page to the first page, and then we build external links according to the pyramid model. The mass is at the bottom of the tower (in large quantities). You can add external links to external links to speed up the inclusion of external links in the index, as well as increase the ranking of the website faster.