What are the best checkout optimization techniques for ecommerce?

The checkout process should be fast, simple, and friction-free. First, ditch the forced account creation. Let people check out as guests. Keep forms short and auto-filled where possible. Show progress indicators so users know how close they are to finishing. Be upfront about shipping costs and delivery times. You also need to have multiple payment options to accommodate different preferences. Finally, enable cart-saving features so shoppers can return later without starting over