I wrote down notes too!
It can do LaTeX and code, and be updated in real time so those were real time notes!
Some other examples
* https://briantliao.com/interviewing-notes/
* https://briantliao.com/deep-learning-notes/
* https://briantliao.com/guitar-notes/
didn't see anything obvious about messaging-style IPC like jms/0mq etc or more synchronous HPC mechanisms like MPI, which are also good/important topics to consider depending on the use case