Data analysis

Hello Kobo toolbox users!
As I'm new user of this tool, i've some issues.Please help in this regard.
1. Is there any licencing part for user to use this professionally.
2. How to analyse xls data? should I learn excel separately ? or is there any analyser available? can we add date in BS?
4. should I download each record of excel file separately to analyse?
5. If I want to control one question like how many family members are there in your family?, and if 4 , then after 4th data insertion, add new group should not come out. What logic should I use?
6 Is there any way to control duplicate data entry in the system?
we are making village profile and will collect data using tab.
This is first time we are going to use in our place. So any suggestion, advice and supports are highly welcomed.

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