How are you? Many themes (particularly the ones from Shopify) have built-in order notes features. You can enable this by going to customize themes > Cart > Go to Cart page > and then enable cart notes.
This note section will be located on the cart page (before they checkout the order). It's perfect if the customer has special instructions or if you require them to enter a text for customization. I hope this helps.
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This is PageFly Page Builder team
You can refer to this help article from Shopify to know how to add a note for the cart page before going to the checkout page.
Hope this helps!
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