HTTP

OPTIONS

https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/OPTIONS

POST

https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST

GET

https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/GET

Restful

https://restfulapi.net/

https://restfulapi.net/rest-put-vs-post/

https://aws.amazon.com/es/what-is/restful-api/

Espanol, basico

https://juanda.gitbooks.io/webapps/content/api/arquitectura-api-rest.html

API Dev Ecosystem

https://hoppscotch.io | alien Open source API development ecosystem

Hopp VS postman / others, Hopp is free with UNLIMITED COLLECTION / USER, Open Source!
https://github.com/hoppscotch/hoppscotch

Other APIS Resources

MockAPI is a simple tool that lets you easily mock up APIs

https://mockapi.io/docs

Get a full fake REST API with zero coding in less than 30 seconds (seriously)

https://github.com/typicode/json-server

A collective list of free APIs for use in software and web development

https://github.com/public-apis/public-apis