Code is better because you make it better. You make code better by paying more attention to finding bugs, having better ideas and being able to follow through on them, doing more profiling, doing better testing, learing from and not repeating mistakes made in other code, reading other code to learn better ways of doing things, paying attention to criticisms of your code, knowing when your code is good and when it is bad (it is fine to have both as long as you are not confused as to which is which).