P1

🟠 P1 — how distributed systems reason about “what happened before what”

🟠 P1 — isolating failures so one component’s problems don’t sink the ship

🟠 P1 — solves the dual-write problem; critical for exactly-once in event-driven systems

🟠 P1 — two paradigms for processing large volumes of data

🟠 P1 — distributing traffic across service instances

🟠 P1 — directly relevant to Stripe (multi-tenant SaaS platform)

🟠 P1 — store events, not state; the append-only log as source of truth

🟠 P1 — how you evolve public APIs without breaking consumers

🟠 P1 — the understandable consensus algorithm; know conceptually, not implementation details

🟠 P1 — Peter Deutsch’s eight fallacies; useful as a shortcut reference in interviews