Five years ago I decided to buy rocketbook, which I use as a sort of journal. Obvious things go in there, like meeting notes & action items, but also notes from watching conference presentations, weekly Todo list tracking (ala bulletjournal), and outlines for phone calls I need to make (I find the preparation helps with the anxiety of making first phone calls, by collecting important data i might need and key points i need to accomplish ahead of time). I think I prefer the analog nature vs digital notes apps, and the scanner app helps with posterity concerns. Most notes are not that important a year from now! I used to take notes while reading books, but I've since moved that to part two of the system.<p>For things where I absolutely want to remember something, it goes into Anki. While reading books, I make time to go over the chapters and extract key ideas into Cloze deletions. Helps with recall, and the Cloze format helps with recall since you're given far more context. And perhaps useful for search.<p>For shell / computer stuff, keeping history around helps a lot. In theory important commands could become aliases or functions and kept around via git, but this is more rare.<p>I do have a gnote / tomboy setup that I use mostly for long form writing, but that's less about journaling experiments & discoveries for later reference and more about getting plans and ideas out of my head so I can stop thinking about them, and drafting the occasional blog post.