The easiest way to secure a flash drive (i.e. password protection)?

Hi, my knowledge of computers is very limited, so having said that, I want to learn how to secure my flash drive.

You see, I use my flash drive quite often and keep files that I'm working on there but also personal information that I need for my work. I worry about losing it or someone stealing it and being able to access that information, so I want to learn how to password-protect it so only I can access it. …

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