구글검색 가이드
https://developers.google.com/search/docs/guides/search-gallery
Search Console 사이트 확인
https://support.google.com/webmasters/answer/35179
최적화된 데이터 하이라이터
https://support.google.com/webmasters/answer/2692952?hl=ko
https://www.google.com/webmasters/tools/data-highlighter?hl=ko&authuser=0&siteUrl=http://eond.com/