WordPress general
How To Put WordPress Site Into Maintenance Mode
How to increase Maximum Execution Time for WordPress site
Running database queries in WordPress
Fixing the WordPress email Return-Path header
Adding Custom Fields to a Custom Post Type, the Right Way
https://codex.wordpress.org/Creating_a_Static_Front_Page
https://optimizerwp.com/wordpress-child-theme/
https://codex.wordpress.org/Child_Themes
WooCommerce
How to Setup WooCommerce Pages Using Shortcodes
WooCommerce Documentation
WooCommerce Developer Wiki
Product thumbnail size not editable after last update
The Ultimate WooCommerce Checkout Customization Guide
Add a Message at Top or Bottom of WooCommerce Checkout Page
Theme support
https://wordpress.org/support/theme/sparkling/
https://www.google.se/search?q=content-single+not+loaded+from+child+theme