I tried doing a paper log a few years ago, but it didn’t last long. Probably because I overdid it, trying to put everything from moon phase, air pressure, wind speed/direction, general weather, water temp lures, depths, etc, etc in it.
Now instead, I always just take pictures of my trips.
If it’s an awesome bite, I’ll take pics of the fish, hot lures, and a pic of some waypoints from that day. All of my trolling rods are labeled, so I’ll even take a pick up the hot rod of the day (5 color leadcore, 300′ copper, etc).
If it’s something out of the ordinary, I’ll chicken scratch something down and take a picture of that as well.
A year later, I can look at the pics, see what I caught, what was the best bait on the best rods and see a picture of waypoints 1,252 and 1,253 for example. From there I can go onto my graph and look up those waypoints and see obviously where it was, but also other things like water temp, time of day, mapped depth, actual depth, etc.
I do my absolute best not to “fish memories,” but year to year there are definitely patterns to follow. It’s pretty rare for me to ever feel like I’m throwing darts blindfolded (unless I’m fishing for fish I don’t normally target, especially on a new body of water)