Beware of the WordPress Appearance Editor! →
If you’re poking around the WordPress dashboard, it’s pretty easy to dive into making custom changes to your theme after you find the WordPress Appearance Editor. While it’s not necessarily a disastrous choice for simple changes, this feature can be misleading, and as RachieVee points out in this great post, using it can seriously stunt your WordPress learning. If you’re just getting into editing your themes code, stop what you’re doing and read this one first.