Problem: You’ve finally found a theme you like but you want to modify it. The modifications are pretty simple but what happens when you want to upgrade the theme? Do you really want to go through all those files again hunting down the changes? Don’t you wish you could just upgrade and be done with it?
I’ve been there. I’ve done everything the wrong way at least twice. Learn from my mistakes. Here’s the right way to modify your theme and protect it against any future upgrades. And don’t worry, it’s really simple. In fact, I've written out most of the tough stuff for you.