[HOWTO] Using WhatsApp under shelter

Thank you. A few followup questions, four main questions, I hope you can answer each one please:

If I install an app both inside and outside the shelter, how do I keep each one current? Do I need to install the app store both inside and outside the shelter as well?

IF I were to turn on location on my phone, all apps INSIDE the shelter would NEVER know my location, because, as you said, apps inside the shelter do not know any data that is outside the shelter. Is that correct?

If an app needs other, “helper” apps to work, then in the shelter I would need to install all those helper apps. Is that correct?

Finally, I am having a hard time envisioning the case in which a person would use Shelter. May I ask, what do you use it for? How does it help you? What are you doing with it?

Thanks.