In my earliest baby Perl, I:

• Didn't know hashes existed and used masses of scalars instead.
• Didn't know chomp, split, etc. existed and used masses of regexen (which occasionally, but not always were appropriate) instead.
• Didn't use any subs.
• Didn't use strict or warnings. Didn't know that they existed.

Looking back, it's some of the worst code I've ever seen. Now I've made some improvement, but am still learning. If only I had found the Monastery sooner...