Digital Marketing & SEO
Help good products get found — the commercial skill that pairs with everything else here.
Why it's in demand
Remote-friendly, freelance-friendly, certification-rich
Realistic timeline
2–4 months to freelance-ready
Free resources
6 curated links
Marketing is the fastest of these skills to monetise, because results are measurable and clients can see them within weeks.
It also compounds with every other skill on this page. A developer who understands search, or a designer who understands funnels, is worth considerably more than one who doesn't.
What you'll be able to do
- Earn recognised free certifications from Google and HubSpot
- Grow organic traffic to a site you or a client owns
- Run and measure paid campaigns without wasting budget
Start here
Build depth
Google Skillshop
Free official certifications in Google Ads, Analytics and YouTube.
Semrush Academy
Free technical SEO and content marketing courses with certification exams.
ASO Mastery — App Store Optimization
Learn how to improve your app's visibility, downloads and organic growth. The full course is free on YouTube.