I shot my first deer in 1965, and my first elk the following year. Back then I didn't even carry a camera with me so I didn't even get pictures of them.
In the early '70s I started a lined, small bound book where I recorded my reloading data, bullet casting data, and started listing a line for each elk that I killed; the year, bull or cow with number of points for bulls, where I shot it, and what rifle and bullet. It's on it's second page...
I went on my first guided hunt in 1999, for a Dall ram, mountain caribou, and a wolverine and I took some, but not enough pictures of that hunt.
In 2000 I went on my first South African hunt, and again I took a camera. A few years later, I couldn't remember names and other details of that hunt, so on subsequent hunts, I took a small spiral notebook for somewhat of a journal that I filled out each night.
I tend to get wordy when I write, so I've only done that journal on my African hunts, and not my other international hunts or hunts here at home.
I also have a section in my computer where I keep a copy of most of the pictures that I take. I have them organized by year with subsections of months and major trips.
I also have another section in my computer where I've listed all of the animals that I have shot and have had mounted. Listings there include the year that I shot it, the year the mount was finished, a code for the taxidermist, what rifle and bullet that I used, and the cost of the taxidermy mount.