Aggregations

Accumulators

Average, count, sum, etc.

Add Fields

Add fields to the output of a doc

Cursor-Like Stages

Rather than passing logic to the cursor, some logic can be in the aggregation pipeline directly

GeoNear

Work with GeoJSON data

GraphLookup Across Collections

recursively parse & merge data between 2 collections leveraging a "target" collection

GraphLookup

recursively parse & reconstruct query output per parameters

Learn Graphing with MongoDB

a look at graphLookup

Grouping

group data into custom-made categories

Aggregations

Compiling Documents & running logic before returning

Lookup

Something like a "join"

Match

Projection

Shape the output content of a query using the projections

Learn Sampling with MongoDB

native data sampling in mongodb

Aggregations

Offloading complex data-aggregation logic from the an api that consumes mongo directly to the db with tools like matching, projecting, grouping, unwinding arrays, looping up content between collections, facets, and more

Accumulators

Create a new document for each item in an array