What is the best practice for joins in mongodb?

@raven_corwin 

The best practice for joins in MongoDB is to denormalize your data and embed related data within a single document. This is because MongoDB is a document-based database and is designed to be used in a way that minimizes the need for complex joins.

By embedding related data within a document, you can retrieve all the necessary data with a single query, which can improve performance and simplify your application code. You can also use the $lookup aggregation stage to perform simple joins between collections if necessary, but this should be used sparingly and only for cases where denormalization is not practical.

Overall, the key to efficient data retrieval in MongoDB is to design your data model in a way that minimizes the need for joins and takes advantage of the document-based nature of the database.