I've tried various things through the years. Starting with paper notebooks, until the early 2000s. I still flip through them from time to time to refresh my memory.
From then until about 2012, I used Twitter and a blog. http://nickporcino.com/meshula-net-archive/archive.html Forgive the terrible early web-look. From the cloud on the side, you can see that I tagged posts, and this tagging system served me very well. Of all the things I have tried, this archive is the most useful. I wish I still use it, but the scaffolding I wrote for it is very old, and I don't have time to upgrade it.
Until a couple of years ago, I used gists as a notebook. eg.
developing a new version of Landru scripting system: https://gist.github.com/meshula/48a62b20b3db57fdd7e70b78567fa316
exploring static initialization in USD: https://gist.github.com/meshula/f192d3797567c53e55af65646b5c327b
or https://gist.github.com/meshula/371e0d468d7395cfc505b0ab89c31b21
The last one is an interesting example because it led to "Design to Bind" (attached).
should have been a blog post: https://gist.github.com/meshula/0d5502ab6e6ed98f9ba005507e323c90
general notes: https://gist.github.com/meshula/e5f1c277129b7426b9a3d5bcd7dc40dd
gists are good for evolving documents and general note taking.
About a year ago I stopped using gists, because once I had a sufficient body of them, the disadvantages became overwhelming.
search is garbage scrolling back in time is extremely slow order of entries is not stable, so you can never guess how many times you will have to hit "Older" to find a note it's undiscoverable, aside from the a few gists that I pointed people to, I get zero help or feedback
For a year, I tried a notes archive on github. No upside to gists except at least I can have a file hierarchy and search is good.
Now I'm using Google Docs which is (1) good for editing, (2) the ABSOLUTE worst to find anything. Search returns results across hundreds of documents that have been shared with me, and it's impossible to find anything. Organizational tools are comical.
Best was my hand carved web site. But it's so ugly I'm embarrassed to post there, even though I could do it. I don't want to load CSS into my brain again, so I have shot myself in the foot.
Second best was paper, because I can rapidly scan notes and refresh my brain, but sharing was the worst. Once I got to two shelves of paper it started to get hard to remember where a particular note that I wanted was hiding.