Example: youtube: https://developers.google.com/youtube/v3/docs/videos/list
HTTP: messages, GET, POST, headers, body, URI
MDN: https://developer.mozilla.org/en-US/docs/Web/HTTP
In particular,https://developer.mozilla.org/en-US/docs/Web/HTTP/Messages
Tools: curl, Postman and many others cURL: curl.se
Read API documentation (each is differnt) https://docs.github.com/en/rest/overview/endpoints-available-for-github-apps https://developers.google.com/youtube/v3/docs/playlists/list
(more references at end )
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