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skills/growth-hacking/SKILL.md

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+# Growth Hacking
+
+**Growth experiments, viral loops, and acquisition strategies**
+
+## Growth Framework
+
+### AARRR (Pirate Metrics)
+1. **Acquisition** - Getting users to your product
+2. **Activation** - First great experience
+3. **Retention** - Coming back
+4. **Revenue** - Monetization
+5. **Referral** - Viral growth
+
+## Growth Experiments
+
+### Experiment Design
+1. Form hypothesis
+2. Define success metrics
+3. Set sample size
+4. Determine duration
+5. Analyze results
+
+### A/B Testing
+```typescript
+const experiment = {
+  name: 'CTA Button Color',
+  variants: {
+    control: { color: 'blue', traffic: 0.5 },
+    variant: { color: 'red', traffic: 0.5 }
+  },
+  successMetric: 'clickthrough_rate',
+  duration: '2 weeks',
+  minSampleSize: 1000
+}
+```
+
+## Acquisition Strategies
+
+### SEO & Content
+- Long-tail keyword targeting
+- Content clusters
+- Guest posting
+- Backlink building
+
+### Paid Acquisition
+- Facebook/Instagram Ads
+- Google Ads
+- LinkedIn Ads
+- Retargeting campaigns
+
+### Viral Loops
+- Referral programs
+- Social sharing incentives
+- Network effects
+- Word-of-mouth triggers
+
+## Activation Optimization
+
+### Onboarding
+- Welcome email series
+- Product tours
+- Quick wins
+- Progress indicators
+- Checklists
+
+### Aha Moment
+- Identify core value
+- Time to value (TTV)
+- Remove friction
+- Guide to success
+
+## Retention Tactics
+
+### Email Campaigns
+- Drip campaigns
+- Re-engagement emails
+- Feature announcements
+- Usage tips
+
+### In-App Engagement
+- Push notifications
+- In-app messages
+- Feature highlights
+- Gamification
+
+## Referral Programs
+
+### Program Design
+- Incentive structure (both sides)
+- Sharing mechanics
+- Tracking system
+- Fraud prevention
+
+### Examples
+- Dropbox: Free storage for referrals
+- Uber: Ride credits
+- Airbnb: Travel credits
+
+## Metrics & KPIs
+
+### North Star Metric
+- Single most important metric
+- Reflects core value
+- Leads to revenue
+- Easy to understand
+
+### Supporting Metrics
+- CAC (Customer Acquisition Cost)
+- LTV (Lifetime Value)
+- Churn rate
+- Viral coefficient (K-factor)
+- NPS (Net Promoter Score)
+
+## Tools
+
+- Mixpanel / Amplitude (analytics)
+- Optimizely / VWO (A/B testing)
+- ReferralCandy (referrals)
+- Intercom (engagement)
+- HubSpot (marketing automation)