Once a program has been compiled, it's tough to get a peek at the source code or to manipulate its behavior. But there is one thing we can do, which is to edit the hexadecimal values inside the binary files. This will sometimes reveal information about a file, or allow us to modify its behavior if we can edit the right bit.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-install-and-use-hex-editor-on-kali-linux