How do you perform CRUD operations in MongoDB?

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The four CRUD operations in MongoDB are exposed as collection methods. Create — insertOne() and insertMany() . Read — find() (multi-doc cursor), findOne() , aggregate() for pipelines. Update — updateOne() , updateMany() , replaceOne() ; uses operators like $set , $inc , $push . Delete — deleteOne() , deleteMany() . Bulk operations — bulkWrite() for batched mixed writes. Atomic at document level — single-document writes are atomic; multi-document need transactions. Know the major query operators ($gt, $in, $regex, $exists) and update operators ($set, $inc, $push, $pull, $addToSet). The difference between updateOne and replaceOne (update modifies fields, replace replaces the entire document). Upsert for create-or-update patterns.