The notes are originally written in markdown. In my case, I write my notes using obsidian during the lecutre and revise it when I'm home, although I am trying to move away from that piece of software. The notes are stored as .md files under the [content](./master/content) folder. The notes are then built into a website using [HUGO](https://gohugo.io), a static site generator. I used a theme called [Zettles](https://github.com/crisrojas/Zettels), I have slightly modified it so that it can render math using KaTeX.
Yes! Absolutely! You can add your own notes or fixes or anything really. You can contribute by creating an issue or by making a pull request. You can also contact me directly if you have any suggestions or concerns: [mail@sasserisop.com](mailto:mail@sasserisop.com) Please note that I will not accept adding instructor materials without their prior consent. I also do not condone academic dishonesty.