What was your most recent "aha moment" with TYPO3?
At first, I didn't dare to touch anything related to coding—I'm just not a developer. But the more you work with TYPO3, the more confident you become in diving into new areas. And you'll notice that it isn't even that hard. Look at me: I now know a bit of PHP (to read) and I know where to find specific parts of TYPO3.
In any case, I just recently had the heart to edit TypoScript constants for a custom Google Maps extension. It's actually a good feeling to take steps in new areas you previously feared to go.
One huge “aha moment” was when I started to change translation labels (which we store in Git) myself instead of putting a new issue into our Sprint Board for the developers. So now, I change translation labels myself. The developers only need to review my changes, and I don't need to wait for the little things anymore. And as a nice side-effect: I learned the Git basics as well with that.