Full Answer

Priority order: 1. Purchase (critical): Revenue attribution depends on this. Fix first. 2. Begin_checkout: Cart abandonment analysis requires it 3. Add_to_cart: Remarketing pools need this data 4. View_item: Dynamic product ads, product-level analysis 5. Page_view: Session tracking, audience building 6. Custom events: After basics work, add business-specific tracking Don't try to track everything simultaneously. Get purchase working reliably, verify with test orders, then expand. One working event beats ten broken ones.