The base image lifecycle nobody owns until it hurts, written for the platform engineer who owns the substrate every other team ships on. Choose an image on maintenance cadence, C library behaviour, size and licence rather than on first impressions; understand what tag and digest pinning each cost you operationally; establish a rebuild cadence, because an image is only as patched as its last build; retire an image across teams who have no incentive to move; decide whether an internal base image is worth its maintenance burden; and produce the age distribution across your estate, which is usually the most revealing number a platform team can put on a screen.
Nothing. Every course, exam, and certificate on the catalog is free — including retakes. All you need is a free Safeguard account.
None. The flagship course, Safeguard Certified Practitioner, is a beginner-level course — basic familiarity with how software is built helps, but every exam question is answerable from the lessons themselves.
You can retake it after a 24-hour cooldown, as many times as you need. Retakes are free, and each attempt draws a fresh random set of questions.
The Safeguard Certified Practitioner credential is valid for 24 months from issue. The expiry date is printed on the certificate and shown live on its public verification page. Renewing means passing the current exam again.
