(SEO (SearchEngineOptimization), translated into Chinese as search engine optimization, is a relatively popular online marketing method. Its main purpose is to increase the exposure of specific keywords to increase the visibility of the website, and then increase sales opportunities. There are two kinds of SEO: off-site SEO and on-site SEO. The main work of SEO is to optimize the web pages by understanding how various search engines crawl the Internet pages, how to index them, and how to determine their ranking of search results for a specific keyword, so as to improve the ranking of search engines, so as to increase the number of website visits, and finally improve the sales ability or publicity ability of the website.)