What all I can manage in the apps by myself?

You can manage your apps from the admin panel by yourself:

1. Update new banner to your Magento mobile app
2. Manage the product quantity in your app
3. Enabling the Payment and Shipping methods
4. Adding new products in Magento Mobile App
5. Adding sale products in Magento Admin Panel
6. Update or manage the categories in your app
7. Embedding the address, phone and email id for the business on contact us screen