Learn how to set up HTTPS on a Linux server using a wildcard certificate from Let's Encrypt and set up the Nginx website configuration files accordingly.

Learn what HTTPS and TLS are, what certification authorities (CAs) are, what Let's Encrypt is, and the difference between regular and wildcard certificates.

Learn how to sign Git commits using SSH keys, how to set up Git to remember your passphrase, and how to verify your commits locally and on GitHub.

Learn how to generate SSH keys, why you should use passphrases, how to use your SSH keys on GitHub, and more.

Learn how to password-protect files and directories on Linux + Nginx in 4 steps using HTTP Authentication.

Learn how to securely set up a Debian or Ubuntu VPS (Virtual Private Server) from scratch in 11 steps.