Hi Linux user :) It makes some sense to define your threat model first.. That can save time and make things clear for yourself. For example, are you using a desktop computer that you will never take outside and are you living at the 13th floor ? Or do you have a laptop that you take with you every day ? In the latter case it may make sense to look at disk encryption. A nice toy to play with some security and privacy things on Linux is Tails.. Tails is also an easy way to show friends, family and colleagues some security and privacy features of Linux on a small pen drive, or to carry a few files safely with you.