Node.js, an open-source, cross-platform JavaScript run-time environment, and Java, programming language, are two common preferred backed technologies for mobile app development.

It helps to determine what users can do and look in the mobile app and how and what part of the data could be shared with users and admin panel.

No, the complexity of mobile apps vary according to the type. It depends upon the requirements of your project. In the one month time-frame, a basic application can be developed.

Here is the basic App Development process one should follow:-

• Analyzing Requirements
• Wire framing & Designing
• Development
• Testing
• Deployment
• Support and Maintenance

A product roadmap addresses the now, next, and later of your  product. A roadmap creates a collective consensus for the direction of the product and helps determine the level of investment at each future stage of development.

• Banner ads
• Notification ads
• Interstitial ads
• Notification ads
• Advanced overlay

A tablet has a higher screen resolution and size in comparison to a Smartphone. The only effort required in tablet app development will be the adjustment of screen resolution.

Yes, there are many app development software that are free and very easy to use like Appy pie, App sheet, Zoho creator, Jira and many more along with free trials.