Don't worry,do as i say.
If you know anything about AES Crypt,you can try it,it is a free download source.
https://download.cnet.com/AES-256-bit/3000-2092_4-10544070.html
I also recommend this one to you, but you need to pay a small fee to use it.
https://www.androidphonesoft.com/resources/password-protect-a-folder-on-windows-10.html
Uh huh...... How about AES Crypt,it's a very powerful tool,but it's important to know as much as you can about it before you use it. If you don't know anything about it or about computers, it probably won't work for you.