This document summarizes four shopping cart optimization ideas presented in a 30 minute webinar. The ideas include: 1. Hiding top-level navigation on cart pages to reduce distractions. 2. Adding a more prominent progress bar to indicate checkout step completion. 3. Hiding a distracting promo code field on cart pages and only exposing it if needed. 4. Adding a checkbox to automatically populate billing/shipping fields if they are the same, simplifying the checkout form.