Digital marketing — reach customers, prove it works
Reaching customers online — and proving it works — is core to almost every business today. Learn search and SEO, social media and content, paid ads, email and funnels, and how to measure what really drives results. 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 — the basics
Brand new to this? Start here. What digital marketing is, the main channels, and the everyday words — audience, conversion, funnel, ROI — in plain language.
Search & SEO
How search engines rank pages, keywords and intent, on-page basics, and earning visibility without paying per click.
Social media & content
Choosing the right platforms, planning content, engagement over vanity metrics, and building an audience that trusts you.
Online ads & PPC
Pay-per-click and paid social, targeting and bidding basics, budgets, and writing ads people actually click.
Email & funnels
Permission and lists, the marketing funnel, a clear call to action, and nurturing leads into customers without spamming.
Measuring & analytics
Goals and conversions, the key metrics (CTR, conversion rate, ROI), reading a dashboard, and deciding what to do next.
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