VeraCrypt - Free Open source disk encryption with strong security for the Paranoid)

VeraCrypt will protect your files by encrypting them with a passphrase. It creates a protected area, called a volume, on your computer or external storage device. This entire volume lives inside a single file called a container, which you can open (or mount) and close (or dismount) using VeraCrypt.

For example, the files you found on different telegram pages can be saved on a USB stick/flash drive, but you don’t want anyone else to take the USB stick/flash drive and look at its contents.
This program gives you a save storage.