Yeah lots of things, You can read apple documentation. Or you can for udacity , udemy courses

Future or VR is huge , for students tell them by using VR they dont need move to any place to attend diff lectures . They will wear the VR device and feel like they are sitting in a class room , listening to lectures , answering questions , asking questions .

There are lots of free tutorials also available in youtube . try them .

Try Mark Price tutorial from udemy..

Seriously , There is no such website . I can help you to make ur app in free by guiding you . Your question should be , any iOS Dev doing charity by making free app .:cool:

does it compressing the image volume as well .

Before the task finish r u sending another image to print. The error seems to be like this. In case of multiple images all images should be in a queue , First come first serve. Till one job is not done . another image should wait.