Add a custom field to Edit Product page. Add a custom tab to organise it.
WooCommerce Tips
Change the ‘No products were found matching your selection’ message
Change the text without modifying the template file.
Style a shipping method to highlight it
Insert CSS selectors into the markup to highlight a specific shipping method.
Use CMB2 to block out dates in DatePicker
Create an options page with checkboxes to disable dates in DatePicker.
Defer WooCommerce emails for a few minutes
Defer WooCommerce emails for a specified time after the normal delivery time.
Add BCC to WooCommerce emails
Add an email address (or two) as BCC to all WooCommerce emails.