The three most important aspects of debugging and real estate are the same: Location, Location, and Location.
Programming languages, like pizzas, come in only too sizes; too big and too small.
If you cannot grok the overall structure of a program while taking a shower, you are not ready to code it. 
When debugging, novices insert corrective code; experts remove defective code.
When teaching a rapidly changing technology, perspective is more important than content. 