WordPress dynamic API reference for WordPress bundled plugins and default themes.
- Twenty Twenty-One is now the default theme for new WordPress installs, since WordPress 5.6.
- Find a summary table of the themes delivered with each version of WordPress at WordPress core bundled themes by version.
- audio – Displays uploaded audio file as an audio player
- caption – Display the caption for an image. Standard WordPress shortcode
- embed – Embed media
- gallery – Display the attached images in a gallery
- playlist – Playlist
- video – Embed video files
- wp_caption – Display the caption for an image. Standard WordPress shortcode
The API Reference for WordPress core is now in core.wp-a2z.org
So is the Block reference for WordPress