Track end-to-end Shopify performance in Looker Studio with KPIs like orders, net and gross sales, returns, and average order value. Understand customer behavior with metrics for new vs repeat buyers, lifetime value, conversion rate, cart abandonment, and refunds. Evaluate marketing efficiency using traffic source, ad spend, ROAS, and customer acquisition cost. Compare product performance and inventory to highlight best sellers and revenue drivers. Use these insights to optimize campaigns, merchandising, and profitability.