The best API 4 learning?

Hi guys,

I'm in my way of learning API.
so what is the fast, easiest and the best 3rd party API for learning and testing purpose?

Is it twitter api? google map api? facebook api? etc ??? what api for practice?

Thanks in advance.

CI-3 Rusty ?

Depends what your goals are, but if you're going to have a career in dev, you're going to end up working with many. For a good learning experience try the Amazon bookstore. It's one of the more complicated ones.

Expert Website Development - Temecula, CA
Community Auth For CodeIgniter 3

Stripe
Paypal
Authorize.net
no matter what the service or app, eventually someone has to get paid so this is really practical to learn. these are the three top credit card transaction services (in the united states). they have great sandbox environments for api testing, tons of documentation, and many libraries on github to get you started.