How SoloLearn Lesson System works?

Question

so that user can download them as offline? Did they use Sqlite for this or anything else? I just want to know the breakdown of making it.

Answer 1

Essentially what I am thinking, is that they have a zip file containing every piece of information. Probably in JSON format which the app understands, and can convert into a lesson you understand in a GUI. Please note that this may not be the exact way SoloLearn handles this, it is an estimate.