How programs actually run, close to the machine.
Computer systems notes explain how programs interact with memory, operating systems, and services. Start with memory addressing, then examine the client–server boundary through HTTP and APIs. These examples establish a basis for later work on memory hierarchies, protocols, concurrency, and distributed systems.
A speculative learning note that starts from C pointer dereferencing and uses simple mathematical models to reason about addresses, aliasing, memory hierarchy, and distributed memory.
A learning note from my first Django and Vue project: what changed when frontend-backend communication stopped feeling like automatic UI state and started looking like an explicit HTTP boundary.