Make sure to watch with Subtitles/CC turned ON.
In this example, I am creating a key pair using RSA (Rivest-Shamir-Adleman) cryptosystem.
Executing this command will provide you with a private key, which you should keep in your ".ssh" directory or on your USB, and with a public key, which, for example, you should add to your GitHub/BitBucket/GitLab account, or to your Linux VMs ".ssh/authorized_keys" file.