I've actually spent some time now trying to help you to ask questions in a better way. But you continue to ignore the help, ignore the suggestions and refuse to answer simple questions. What you quote above is not a list of questions, it's a list of potential attackers. If you indicate that you actually only want to protect your files from a nosy stranger, locking your device or hiding your data in a special directory might be enough. But, on the other hand, if you actually want privacy that would keep border control at bay, you might want to look into encrypted file systems. So, by actually telling us what kind of privacy you want, you help us suggest a proper solution. See, it's that simple.