Well, our cavern tours in March taught me I didn't know the limits of my "underwater body" very well. I've been working on that by swimming under and through everything I can find where I fit
Andrew Georgitsis taught me that I hadn't conquered my midwater disorientation problem nearly as well as I thought I had. Lesson there may be that a weak spot is a weak spot, and you had better not stop paying attention to it. I'm working on that by trying to spend some time each dive with my eyes closed, deliberately going into "unusual attitudes" and recovering without opening them.
My Rec Triox class taught me that I still don't think terribly well underwater, and it doesn't take a huge amount of stress before my buoyancy control starts to get shaky. I'm working on that -- by practicing failures, and by doing things like carrying a deco bottle last night.
I learned how to replace my own wrist seals -- yay!
Between Rec Triox and AG's Ratio Deco class, I learned some more about decompression theory, and it was fascinating.
And . . . This is the hardest one to quantify or describe. Diving with KMD has repeatedly taught me lessons about self-discipline and focus. They don't necessarily stick very well, but I do remember them. If I dove with people like him all the time, I'd be a better diver.
My trip to Los Angeles, and my dives with visiting divers here, taught me that you shouldn't ever discount the appeal of a dive just because you're jaded with it. A diver new to a place may find the starfish fascinating
And, over and over again, I was reminded that at least half of the fun of this sport is the wonderful people you get to do it with.