MIT 6.828 https://inst.eecs.berkeley.edu/~cs162/fa20/ [https://pdos.csail.mit.edu/6.S081/2021/schedule.html/](https://pdos.csail.mit.edu/6.S081/2021/schedule.html%5B/%5D(https://pdos.csail.mit.edu/6.S081/2020/index.html)) OSTEP http://pages.cs.wisc.edu/~remzi/OSTEP/ http://beej.us/guide/bgipc/html/single/bgipc.html