I got started keeping a dev journal by logging bugs I fixed. I would document the problem, recreate steps (if QA supplied none), what I thought was the problem,

I got started keeping a dev journal by logging bugs I fixed. I would document the problem, recreate steps (if QA supplied none), what I thought was the problem, what was the actual problem and finally how I fixed it. I also kept a note of where in the source the bug was found. Sure, there are automated was to do this, but we didn't use those at the time and, well, it led to a good habit, so I'm happy. Sadly, as much as I hoped it would, it hasn't translated into a good habit of writing a personal journal.