Lab notes, not slide decks

Free hands-on courses for Linux, Python, and networking.

Free courses on Linux, Python, routing, hypervisors, and the tools you actually open at work.

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Courses

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Foundations · Beginner

A short introduction to systems work

A compact orientation for the rest of the catalog: how to learn with a terminal, what to install, and how to keep a lab from becoming a junk drawer.

1 lessons Reference · Beginner

Actuators: Types, Operation, Selection, and Control

Learn how electric, pneumatic, hydraulic, thermal, and mechanical actuators work, how to size and control them, and how to install, troubleshoot, and maintain them safely.

6 lessons Web · Beginner

Apache HTTP Server course

Install Apache, read the config layout on Debian/Ubuntu and Windows, and put a virtual host on the network without guessing.

27 lessons Reference · Beginner

APIs: Concepts, Design, Requests, Responses, and Integration

Learn what APIs are, how HTTP requests and responses work, REST design, authentication, errors, testing, security, versioning, and API integration.

22 lessons Voice · Intermediate

Asterisk course

Install Asterisk, register a SIP endpoint, and write a dialplan that rings a phone.

29 lessons Networking · Intermediate

CCNA online course

Routing, switching, and IPv4 fundamentals aimed at lab work and the current CCNA blueprint — written as explanations you can verify on a switch, not as a dump of exam dumps.

155 lessons Networking · Intermediate

CCNA Security online course

Device hardening, AAA, filtering, and site-to-site VPN ideas that still matter on IOS-XE, even though the old IINS exam numbers are retired.

38 lessons Programming · Intermediate

Create a web crawler in Python

Fetch pages you are allowed to fetch, parse links, and stay inside a polite crawl policy.

3 lessons

Guides

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Apache Configuration Files on Ubuntu Learn where Apache configuration files are located on Ubuntu, including apache2.conf, modules, listeners, snippets, Virtual Hosts, and enabled directories. Linux Kernel: Purpose, Architecture, and How to Check the Kernel Version Learn what the Linux kernel does, how it connects applications to hardware, how kernel architecture works, and how to check the running kernel version. Linux PATH Environment Variable: Command Search Paths and Usage Learn what the Linux PATH environment variable does, how shells search it, how to run scripts, change PATH safely, and troubleshoot command lookup. How to Find the Full Path of a Command in Linux Learn how which, which -a, PATH, type, and command -v help you find Linux command executables and understand shell command resolution. Add Python to PATH on Windows Learn how to add the folder containing python.exe to the Windows PATH variable, then verify Python from Command Prompt. What are functions? Name a block of work, pass arguments, and return a result you can test. Raspberry Pi 5 Review: Specifications, Ports, Power, Operating Systems, and Uses A practical Raspberry Pi 5 review covering hardware, ports, RAM, power, cooling, storage, operating systems, installation, projects, limitations, and accessories.