Similarly, people who are less educated and young users (kids) are a big market sector. The design must be intuitive enough to help them use your app without hassle.
For making an app for Android your need Android Studio and for making an iOS app you can use XCode Development Kit.
For making an offline experience, you need to learn serverless computing. It will be helping you in creating an offline software application.
The best apps are those that solves a big problem. So if you find it hard to pick a goal, think about your problem first.
