This MongoDB crash course covers CRUD operations and advanced queries. After installing MongoDB and its shell (mongosh), the video demonstrates database and collection management, data insertion (single and multiple records), complex queries (using operators like $eq, $gt, $in, $exists, $expr), sorting, limiting, and skipping results. Data updating methods (updateOne, updateMany, replaceOne) and deletion (deleteOne, deleteMany) are also explained, showcasing various update operators ($set, $inc, $rename, $unset, $push, $pull). ssssssssssssaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa sdfasdfaaa see this information we can just say DB.users to access the collection and we can call the find method. The find method just gets every single thing inside of the database. and as you can see we have an array with one object. That object has a unique ID that's automatically generated and then it has the name of john. Now this underscore ID is something that's automatically generated by MongoDB. Every time you insert a record. So that's really nice. You don't have to worry about generating unique IDs. It just does it for you. Also something interesting about MongoDB that you may have noticed is we didn't have to define any columns. We didn't define any schema. We just said insert this JSON object that has a name and the name is john. there's no schemas. there's no columns that you have to worry about in MongoDB. And instead you worry about things called documents. Essentially every single object you store inside of a database in MongoDB is called a document and documents live in collections and collections live inside of databases. So we have The find() method retrieves all documents. MongoDB automatically generates unique _id fields. No schema or column definitions are needed. Data is stored as JSON-like documents. Documents reside within collections. Collections are contained within databases. MongoDB handles unique ID generation. Flexible data structure with no predefined schema. Access MongoDB collections directly (e.g., DB.users ).