My area of interest within computer systems lies in distributed systems, networking, blockchain, and cloud computing. I've been delving into this field by reading both academic papers assigned in coursework and those I've chosen to explore independently. Here is the list (some links may not work, please use a web-search to search by title):
Multithreading & Multiprocessing
Memory Management
Networking
Virtualization
File Systems
Distributed Systems Theory
Consensus
Datastores
Authentication & Authorization
Big Data Processing
Cluster Computing
Cloud Computing
Content Distribution
Blockchain
Systems for Artificial Intelligence
Tracing & Debugging
Applications
Misc Books/Articles