Adding an extra protection layer to your files is possible thanks to an encryption program of the likes of VeraCrypt. It's an application that allows us to establish an encryption volume as we go. That means that all the data stored in such unit can be encrypted on the fly and only the people with the corresponding password will be able to read them.
Set an almost unassailable barrier
This software can encrypt the entire file system: file names, folder names, contents of each file, free space, metadata... the program stands out for its simple and easy-to-use interface as well as for its lightweight, avoiding that we use too many resources without really needing them. However, we do recommend you to take a quick look at its user manual before using time, if you have never got around to using an app of this nature.
It's a free program that adds an extra improved layer of security to the algorithms used for system and partition encryption, becoming tougher to break down in the case of brute force attacks.