Consensus Protocols in Distributed Systems A Complete Learning Guide — Intermediate to Advanced Table of Contents Foundation — What is Consensus and Why Is It Hard? Core Concepts & Terminology Paxos — The Classic Protocol Raft — The Understandable Protocol Byzantine Fault Tolerance (BFT) Other Notable Protocols Real-World Systems Scalability & Performance Considerations Trade-Off Analysis Design Decisions & Rationale Practice Problems Summary & Next Steps 1. Foundation 1.1 What is "Consensus" an