API help
 

Any good API tutorial or recommended books available?
I want to create my own landing page/sign-up forms.

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If you're going to implement an API backend, read up on RESTful APIs. This is the "right" way to do APIs.

Carefully consider the language you implement in. It's possible to build your API in a number of languages, from PHP and Python to more esoteric choices like Ruby and Node.js. The language you settle on will determine the maintainability, testability, and other factors.