Learn How to Add Custom Field in Shopify Product Page (Debut Theme)

//Copy and paste the code below into your product.liquid

// Following code will display field as required + Will show in checkout page

<p class="line-item-property__field">
  <label for="your-name">Your name</label>
  <input required class="required" id="your-name" type="text" name="properties[Your name]">
</p>

// Following code will display field as required but it will not show in checkout page

<p class="line-item-property__field">
  <label for="your-name">Your name</label>
  <input required class="required" id="your-name" type="text" name="properties[_Your name]">
</p>

// Following code will display optional field in product page 

<p class="line-item-property__field">
  <label for="your-name">Your name</label>
  <input id="your-name" type="text" name="properties[_Your name]">
</p>