Những nguồn học customizer cực chất (ok)

https://github.com/maddisondesigns/customizer-custom-controls
https://wordpress.stackexchange.com/questions/244333/how-to-create-a-control-for-css-opacity-in-the-customizer/244337
https://vi.wordpress.org/plugins/wp-add-custom-css/
https://sushilwp.wordpress.com/2016/01/31/how-to-change-number-of-woocommerce-related-through-customizer-setting/
https://thachpham.com/wordpress/wordpress-development/wordpress-customizer-part1.html
https://gist.github.com/anonymous/d98a46d00d52d40e7dec
https://developer.wordpress.org/themes/customize-api/customizer-objects/
https://wordpress.stackexchange.com/questions/316374/how-to-add-styles-set-by-user-in-the-customizer
https://code.tutsplus.com/tutorials/settings-and-controls-for-a-color-scheme-in-the-theme-customizer--cms-21350
https://www.wpbeginner.com/plugins/how-to-easily-add-custom-css-to-your-wordpress-site/
https://wpforms.com/docs/how-to-add-custom-css-to-your-wpforms/
https://webcusp.com/how-to-add-custom-css-for-your-wordpress-admin-dashboard/
https://github.com/paulund/wordpress-theme-customizer-custom-controls/blob/master/select/post-type-dropdown-custom-control.php
https://wordpress.stackexchange.com/questions/210498/add-post-type-titles-in-customizer-dropdown-list
https://www.cssigniter.com/wordpress-customizer-custom-controls-categories-dropdown/
https://github.com/paulund/wordpress-theme-customizer-custom-controls/blob/master/select/post-dropdown-custom-control.php