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Their are many softwares which you can use to hide your folders, but as you don't want use them, let me tell you a simpler method which you use it just using your notepad to create a simple hidden folder.
You have to use simple Codes(which I have provided) to create your hidden folder.
You can use that hidden folder to hide your documents.
It will also be having a password so that no one can access it.
You can get the codes and can learn how to create password protect folder