None. If you can type and know what a file is, you can start Level 1. Every course begins with the same Linux fundamentals — navigation, files, permissions, pipes — so you build the foundation before anything specialized.

A browser. That's it. The terminal runs in your browser on any device — Windows, Mac, Linux, even a tablet. Nothing to install, nothing to configure. Open the page and start typing.

You type real commands into a simulated Linux terminal in your browser. The terminal teaches you a concept, you practice it immediately, and a quiz checks that you understood it. Labs give you a scenario and let you solve it yourself. Progress is saved automatically.

Yes. Level 1 of every course is completely free — 8 tutorials, 8 quizzes, 2 labs, and 1 exam. No account required, no credit card. Just pick a course and start.

A subscription ($15/mo or $120/yr) gives you access to all four courses for as long as you're subscribed. A one-time purchase ($49 per course or $149 for all four) gives you lifetime access — pay once, keep it forever. Both options unlock the same content.

Yes. Schools and educators get 20 free seats with a teacher dashboard that tracks student progress, scores, and activity. Teams get volume pricing starting at $12/seat. Contact us to get set up.

30-day money-back guarantee on everything. No questions asked. If you're not satisfied, email us and we'll refund you in full. 5% of every purchase is donated to Boys & Girls Clubs of America.

At about an hour a day, most people finish a course in 4-8 weeks. Weekend learners can expect 8-12 weeks at a few hours per session. There's no deadline — go at your own pace.