So lately I am learning about APIs and REST/ful architecture (I'm a plain beginner). I must say it's very interesting.
I find this website very very helpful as a practical implementation of the theory I've been consuming. I'd truly appreciate any recommendation on the subject.

https://apigee.com/console/twitter

It depends if you are looking to consume existing apis or design your own apis.

Using the api of a social media webpage is good place to start. You can find the list of endpoints/ urls they expose to you and what parameters do they expect in the url or body. Try to send wrong parameters and observe which status code and other message do they send.

Then to build your own think how to provide access to some data in a way that is self documenting and accessible to computers and humans. The only frameworks I have experience with are Django and Spring-boot and both are exellent for REST.

@pauldragoslav at the moment I'm looking at consuming existing APIs since we(me and my group) will be creating this Android App that will access a RESTful API from this institution.

I don't know what it is, but I get the most fun by far working with APIs. Something about all that data going in and out is just cool to me. Eventually I'm going to switch jobs to something where I can build APIs all day long!

@coderme
To me it's the available data. Like I don't have to create all this bullshit to access existing info. That's amazing!

@ODXT Yeah, I like requesting this stuff and seeing it actually come back in proper (json!) format. Pretty cool.