This blog lists some technical ways on how to edit WooCommerce checkout page and how you can customize it at almost no cost using a plugin.
Custom WooCommerce Checkout Fields Editor – WordPress plugin
Woo Checkout Editor
How to Add Extra Field to WooCommerce Checkout Page - weDevs
How to Customize the WooCommerce Checkout Page - HollerBox
WooCommerce: Change Input Field to Textarea @ Checkout
How to Customize WooCommerce Checkout Page (The Easy Way)
Customize WooCommerce Single Page Checkout with Woostify
How to Customize WooCommerce Checkout Page (The Easy Way)
How to Edit WooCommerce Checkout Page (Code + Plugins)
How to Move Payments on WooCommerce Checkout - Igor Benić
How to customize WooCommerce checkout page