Please what do I need to manage an app like sololearn, I'm a teacher and would like to develop an app like this for my students.

Answer 1

Why do you want to reinvent the wheel? You could send an email to [e-mail] to ask if it is okay to use this app in class ^^

Answer 2

Okay then. You need to develop an app. The app connects to a server, so you need a server and a server side language. You've got quite a lot of choices, maybe this can help you for your first steps:
https://www.quora.com/How-do-I-build-a-simple-server-client-based-app-in-Android
These of course are only the programming related parts, don't forget content management and moderation once you've published the app ^^

Answer 3

It depends how much you know about front and back-end web/app programming, and what languages you familiar with.

Answer 4

@Tashi. The content is not on coding. smart.ly has something on MBA. I just wish to have some app for my students. Not to reinvent the wheel. Thanks