Everyone knows that debugging is twice as hard as writing a program in the first place. So if you're as clever as you can be when you write it, how will you ever debug it?

The most effective debugging tool is still careful thought, coupled with judiciously placed print statements.

Do what you think is interesting, do something that you think is fun and worthwhile, because otherwise you won't do it well anyway.

Controlling complexity is the essence of computer programming.