Navigating WordPress source code
If you really want to know how WordPress works, if you want to know what you can do with it and what you can’t, if you want to understand how to solve your problems with WordPress, there is one thing that you absolutely have to do. No matter how many plugins you play with. No matter how many themes you install. No matter how many tips and tricks you read about. You have to look inside WordPress. Spend some time with its source code.
