I am itching to learn Wordpress site design, beyond the basics of installing themes, plugins. Where

How do I get to the underbelly of wordpress, and what are the skills needed? I am little envious when I see others who can take themes and customize them further (and able to troubleshoot the pesky plugin errors along the way!). I want to be able to do that too. The last time went near coding was 13 years ago learning HTML. That's the bad news.

The good news is I'm a superfast learner. Just need a kick in the right direction to avoid information overload...so I figure WPMU community is probably the best place to ask :slight_smile: