Answers to the questions we hear most often.
How do I start a lesson? ▼
Pick a topic from
Courses, open any lesson, and the sandboxed terminal loads automatically alongside the reading material — nothing to install on your own machine.
Do I need to install anything to practice? ▼
No. Every hands-on exercise runs in an isolated sandbox in your browser. You just need a modern browser and an internet connection.
I paid for a topic but it still shows as locked. What do I do? ▼
First, try refreshing the course page — access usually unlocks within a few seconds of a successful payment. If it's still locked after a few minutes, contact us via the
Contact page with your payment ID and we'll sort it out quickly.
Can I get a refund? ▼
Yes, within 7 days of purchase if you haven't completed more than 20% of the topic's lessons. See our full
Refund Policy.
Does my progress and streak carry over across devices? ▼
Yes — progress, streaks, and badges are tied to your account, not your device, so you can pick up right where you left off on any browser you log in from.
Is a purchased topic really mine forever? ▼
Yes. Once you buy a topic, it's yours for as long as the platform operates — no recurring charges, no expiry, no re-purchasing to keep access.
How do I delete my account? ▼