It is a big subject that is very well covered in course M201: MongoDB Performance at https://university.mongodb.com. You may also start with https://docs.mongodb.com/manual/reference/method/cursor.explain/
It is a big subject that is very well covered in course M201: MongoDB Performance at https://university.mongodb.com. You may also start with https://docs.mongodb.com/manual/reference/method/cursor.explain/