What Is the WordPress Admin Dashboard? (Overview and Tips)
Ultimate Guide to Customising the WordPress Dashboard - YouTube
WordPress Add Admin styles for certain pages
How To Create WordPress Custom Admin Pages
How to style the WordPress admin area via the theme - Holly Pryce
Customizing the WordPress Admin - Adding Styling | Envato Tuts+
WordPress Style Guide: A Reference For Admin UI Components – WP Tavern
GitHub - bueltge/wordpress-admin-style: This plugin reference elements from wp-admin in an overview with the necessary markup and CSS classes to help you to develop WordPress compliant.