The file contained what project or uni module it was for, and any significant commands (build & run one-liners), and links to documentation. Some of them had a couple of extra commands to run those one-liners if given a relevant parameter (such as “./wtf make”), like tokamak-teapot's run command but with a little extra typing. Basically a README that could potentially do a few actiony things.
Not something that I kept up in later life though. It was helpful for just me when I had a significant bunch of things actively going on or being referred back to, and particularly useful when the work was part of a group project or otherwise shared to others.
This is not necessarily the best solution, as you have to name even very simple commands, but it's not so hard. What I wished was for bash to have two histories, a global history and a per directory history, so I can look at what commands are typically run in a directory. I hear it is easier to do in zsh, but I have no working solution.