I keep a personal journal. I have yet to find looking back over it useful. I helpful in organising my thoughts when writing it down. I used to use Day One but

I keep a personal journal. I have yet to find looking back over it useful. I helpful in organising my thoughts when writing it down. I used to use Day One but now I use a simple web app running that I built to replace Day One and Evernote late last year. I'd build your own journal setup. Plain text files would likely work too. Make sure to back it up. It's a pain changing the system after you've written out 1000's of entries. I tend to write about what's going on and what's coming up as well as what I'm thinking / worrying about. Advice would be to just write it for yourself - assume it'll only ever be read by you. I find that helps me get things down without fussing.