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what is a good 'mature' app which would scan my machines?
That sounds like an excellent topic to practice using the TS Search function. (a famous comment by may instructors: "We will leave that as an exercise for the student.") That will bring up topics/threads where we have discussed apps and whether they are even needed. Then use another web-wide search engine like DuckDuckGo or even Google. In all cases, "consider the source"! Don't take my word for anything! I've got my own biases and misteakes! I'm just saying don't take a magazines comments as always or completely trustworthy; some of them or their writers have been found to be even more untrustworthy than I am!!
The need for a VPN is a topic for a whole topic. I have one but don't always have it running. They are not usually free and I'm pretty much a penny pincher! I read a lot of reviews of companies that offer this service before deciding which to choose.
We already have at least two trained and experienced teachers at TS. I have neither training nor experience and little of what I consider to be another very important characteristic of an effective teacher: patience!