A few days ago, I wrote an article about [a new method for SEO to increase external links], which received a lot of replies from SEO friends. Some said that dig is the last blue ocean in our Chinese SEO market. There are also friends who treat these resources as treasures and keep them secret. When I posted articles a few months ago, I said that domestic dig cannot compare with foreign ones. However, currently, there are countless open-source dig systems, and gradually, dig website administrators have started to become active. Once they become active, such good resources should be utilized by our friends who are learning SEO. According to the URL DIG websites summarized by online friends, Navy has integrated several posts and shared his commonly used URLs here for everyone's reference.