The code is very logical, and what you will start to see soon, are certain "patterns" (or conventions) that are common throughout the system.

When you start to understand these "conventions", your logic will say... "hang on... I did XYZ to a similar element a few days ago, and this one looks pretty much the same... perhaps XYZ will apply here too." In many cases it does...

I am quite ready to admit that I have a less than novice understanding of PHP - but I have contributed TWO zencart modules to the community.

So... look for the logic in the system... it will help you become a real whizz in no time.