The blog traces how search actually evolved. Every algorithm exists because the previous one had a specific flaw and a new one came into existence to fix it.
I went deep over a month to understand how to build a real retrieval pipeline. What algorithms exist, why they exist, and what problem each one was solving when it was invented. Reading this you will come away with a full mental model of how to build a retrieval pipeline for any use case, and how to tune each stage for your specific needs.