Wow, this one is a lot
It taught me Patience definitely. Thus in turn, I'm really good with kids now, mostly because I don't snap and flip out on them when they annoy me because I have a much higher breaking point.
I honestly have started respecting the sun more. Even though I'm not a day person, or religious, I pretty much Praise the Sun for everything it does for this world
It taught me not to laugh at others misfortune until they are dead. In NG+, i was in Sens, and I laughed at the Snakeman that gets hit by the boulder. Come to find out, hes alive, he comes around the corner, swings, and I'm dead. So, without confirmation, I don't laugh until they are dead.
It taught me that there actually are decent gamers out there who aren't disrespectful and actually do live in a world of decency and don't complain saying that the game destroyed their life because the game was good, but the ending(s) was bad.
I also learned that game developers aren't that bad either. From Software practically made me want to cry when the lead Dev said they might not make another game because people didn't like it. He wasn't interested in that it made money, he was interested in what people thought about the game. This was just one reason why I went on a spree of collecting From Software games. I currently own every gamecube, xbox360, and almost all PS2 games. I still need a couple armored cores, the otogi series, Murakumo, and I need to get a PS3 so I can get those games as well.
The last thing it taught me was that you don't need an in your face story to have a story. I plan to be a game dev one day, and seeing how Dark Souls was done, its a big inspiration to know that you don't need to always be upfront to be existant.
I've probably learned more, I mean, Dark Souls made me a better gamer and a better person, and there are so many times I see it, but its hard to describe. Either way, From Software are some of the best Devs ever, and Dark Souls is the best game I've ever played.