The Linux distro you are running informs what the installation instructions will be.
Linux is just a kernel, the rest of the operating system (like what package manager is in use) is the relevant bit.
If you use shared hosting, Certbot is not the right tool for you.
You can try something like CertSage ACME client (version 1.4.0) - easy webpage interface, optimized for cPanel, no commands to type, root not required