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Documents, collections, databases, ObjectId, BSON, schema flexibility, and the MongoDB data model.

insertOne/insertMany, find/findOne, updateOne/updateMany, deleteOne/deleteMany and update operators.

Comparison, logical, array, element, and evaluation operators for powerful MongoDB queries.

$match, $group, $project, $sort, $lookup, $unwind, $addFields, and building aggregation pipelines.

Single/compound/multikey indexes, text/geospatial/TTL indexes, schema patterns, and Mongoose ODM.