Build WordPress Yourself is a great resources. Plain and simple. Launched in March of 2014, BWPY is a resource for building unique WordPress websites. In this context, “unique” doesn’t mean a fancy design unlike any other on the world wide web. Instead, it refers to the idea that you should have the freedom to customize any part of your site, design or functionality.
When you do not know how to do these things, you’re stuck using themes and plugins that do it for you. That means everyone else who uses the same tools can potentially have the same site as you. That’s no fun.
Build WordPress Yourself will teach you how to take control of your WordPress site article by article. There are even full courses to teach you how to do things like build a custom WordPress theme or modify popular themes.
Head on over to Build WordPress Yourself and start reading.