Learn how to harden your SSH server with best practices including key-only authentication, disabling root login, changing the default port, and setting up Fail2Ban.

Quick reference for Docker commands and concepts

Learn how to use the ssh-copy-id command to copy your SSH public key to a remote server for passwordless authentication.

Learn how to install PHP 8.3 on Ubuntu 24.04 with Apache or Nginx. Includes PHP-FPM setup, common extensions, and installing other PHP versions.

Learn how to install, secure, and configure MySQL 8.0 on Ubuntu 24.04. Includes setting up root authentication, creating users, and enabling remote access.

Learn how to install and deploy Odoo 19 inside a Python virtual environment on Ubuntu 24.04. Odoo is a popular open-source suite of business apps for CRM, e-commerce, accounting, and more.

Positional parameters are Bash variables that hold arguments passed to a script or function. Learn how to use $1, $2, $@, $#, and the shift command in Bash.

Learn how to install OpenJDK and Oracle JDK on Ubuntu 24.04. Covers Java 21, 25, and other LTS versions.

Learn how to install and configure Git on Ubuntu 24.04 using apt, the Git PPA, or by compiling from source.

Learn three ways to install Node.js and npm on Ubuntu 24.04: NodeSource repository, nvm, and default Ubuntu packages.

Quick reference for SSH commands and configuration

Learn how to use Python dictionaries to store key-value data. Covers creating, accessing, updating, and iterating with examples.

Learn how to generate SSH keys on Linux using ssh-keygen, copy them to remote servers, and set up passwordless authentication.