Cybersecurity — stay safe, then go professional
Staying safe online is a basic skill for everyone — and a career for many. Learn strong passwords and two-factor login, how to spot phishing and scams, how to keep devices and networks safe, how to protect data and privacy, and how attacks work and are defended against. Six fields, four tiers each (Foundation → Professional). Play free, pass a tier, and earn a certificate of competence you can download, print and share. New questions appear each time you play.
You can play as a guest — sign in with your free 21 ID to keep progress and claim certificates.
Build your skills
Start here — staying safe online
Brand new to this? Start here. What cybersecurity is, the everyday threats, and the basic words — malware, hacker, breach, phishing — in plain language.
Passwords & accounts
Strong, unique passwords, two-factor authentication, password managers, and why reusing passwords is dangerous.
Phishing & scams
Spotting fake emails, messages and websites, dangerous links and attachments, and social engineering that tricks people, not machines.
Devices & networks
Updates and patches, antivirus and firewalls, safe Wi-Fi, backups, and keeping phones and computers secure.
Data & privacy
Protecting personal and work data, encryption in plain terms, safe sharing, and the basics of data-protection rules.
Threats & defence
How attacks work and how they are stopped — the CIA triad, common attack types, least privilege, and what to do when something goes wrong.
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