Problem is your teacher isn’t entirely off here.

An iPhone can by default only install applications from app store. Contrary to Android where you can allow third party apps. There’s good advantages of that since. You can get what’s virtually youtube premium for free for example. And alot of apps that you can’t get for iPhone.

But iPhone can get exploited by the right zero days. So can android ofcourse. So in a sense you’re more safe with iPhone simply because you have handcuffs on already as a user

Its hard. You could teach her how domains works and how to look for spoofed mails. But generally just dont click links in mails unless asking you first.

Nah its fine. I checked it with virustotal.com to be sure. Dont worry. It sounds more like its simply used for things like ads.

Yes. Take it apart. Dry it off. Youre lucky if its just water. With a bit luck you should be fine.

Very often those “virus warnings” will be from your browser that you allowed to send popups. I suggest next time you get such one. Take a screenshot and show us. If it has a chrome logo anywhere its where the “warning” are from and not real.