As strange as it may sound, I graduated with a CS degree and didn't put in much effort during my time in college so I'd like to go over my undergraduate course material again. I need good resources to learn the following topics at an undergraduate/graduate level :
- Databases and SQL
- Compilers, formal languages and automata theory
- Operating systems
- Computer networking
If you have recommendations on books or courses online that could help me go over these topics, that would be very helpful.
