Frequently asked questions

A short written course plus a hands-on lab that ends with a key — a string you can only get by doing the work. Submit the key and the exercise is marked complete.

No. The course and the lab artefacts (code, logs, traffic) are on the page. Some advanced exercises suggest tools you can run on your own machine, and say so up front.

Exercises marked Free are free forever, and a few Pro exercises are made free each month. You need an account to submit keys, but not a card.

Every exercise, the written solutions, the video walkthroughs and badge certificates. A Pro pass runs for the period you buy and does not renew by itself.

PayPal activates instantly. UPI payments are checked by a person and activated within a day — you will get an email. See the refund policy for the 7-day guarantee.

No. A hint nudges you toward the right place to look. The solution — which does give the answer — is a separate, clearly labelled control.

Complete every exercise in a badge and it is awarded automatically, with a certificate that anyone can verify at its public link. Certificates are issued per badge.

Yes. Team plans give you seats and a manager dashboard for assignments and progress. See teams & enterprise.

Please tell us: contact. Corrections ship quickly and we credit good catches.

On our labs and on systems you own or have written permission to test — yes. Anywhere else — no. That rule is in the terms and we mean it.