You can find more information on the 'Introduction to structured data' from google: https://developers.google.com/search/docs/guides/intro-structured-data On youtube you can also some videos from Google about rich snippets: https://www.youtube.com/playlist?list=PL_AKNGnxBAKLE0YR4WAI6x9eBUjlvPBOn On w3c you have also more information about microdata: https://www.w3.org/TR/microdata/