The Common category includes the following blocks: Paragraph, image, headings, list, gallery, quote, audio, cover, video. The paragraph block is…
This post tests various embed blocks: https://twitter.com/WordPress/status/1057136472321613824 Twitter, wide width https://youtu.be/ex8fMxXJDJw YouTube https://www.facebook.com/6427302910/posts/10156380423617911/ https://www.instagram.com/p/BpmueLLgEn_/?utm_source=ig_share_sheet&igshid=1hcxphic7p9e2 https://wordpress.tv/2018/10/14/kjell-reigstad-allan-cole-how-we-made-our-first-gutenberg-powered-theme/ WordPress TV, full width
https://twitter.com/nacin/status/319508408669708289 This post tests WordPress' Twitter Embeds feature.
https://wordpress.tv/2009/03/16/anatomy-of-a-wordpress-theme-exploring-the-files-behind-your-theme/ Posted as per the instructions in the Codex.