Reading remote JSON

Hi! I am learning to build my first Airtbale apps, I completed the basic tutorials, and now would like to be able to add the ability to read a remote JSON to my app.

First question I have is: The API methods that work within the scripting app will work for custom apps?
In that case is fetch the right way to go for reading remote data?

Also, if anyone has a very basic example of an app reading remote data I will really appreciate that.

Thanks a lot for your time!

any suggestions? Thanks a lot!