Analytics: Tracking

Purpose: Cross-device, cross-session user identification
Implementation: Set user_id when user is identified (e.g., login); send to GA4
Benefit: Accurate attribution across sessions; better audience building

Guides analytics implementation: GA4 setup, event tracking, conversions, and data quality. Applies to web and app tracking across marketing channels.

When invoking: On first use, if helpful, open with 1-2 sentences on what this skill covers and why it matters, then provide the main output. On subsequent use or when the user asks to skip, go directly to the main output.