I wrote a book called "Practical MongoDB Aggregations" to help developers, architects, data analysts, and data engineers understand how to maximize productivity and effectiveness when building aggregation pipelines in MongoDB. The book aims to demystify the MongoDB aggregation framework, which is considered shrouded in mystery for many users. I believe there was a knowledge gap that needed to be filled, and my book provides an opinionated yet informed perspective on assembling aggregation pipelines from well-documented parts. The book includes fully formed example pipelines to help put these approaches into practice, and it's available for free online.