03 · Core Components
These are the Lego bricks of distributed systems. Almost every large system combines several of these. The skill is knowing WHEN to reach for each one and understanding what problem it solves.
Pattern to build: For each component, memorise: (1) What problem it solves, (2) What it breaks if misused, (3) One real-world example that uses it. That’s enough to use it correctly in an interview.
Start with these lessons
From first principles, with a short quiz at the end of each.