What kind of Offline surveys and checklist forms can you create using the NestForms field service software

What kind of Offline surveys and checklist forms can you create using the NestForms field service software

 
How do I use NestForms for creating a mobile survey where you can carry on working without a connection? Is it hard to learn?

How do I use NestForms for creating a mobile survey where you can carry on working without a connection? Is it hard to learn?