1. Get all
  > db.restaurants.find()

2. Limit and sort
  > db.restaurants.find().limit(10).sort({name: 1})

3. Get by _id
  > var foundOne = db.restaurants.findOne();
  > db.restaurants.findOne(foundOne)

4. Get by value
  > db.restaurants.find({borough: "Queens"})

5. Count
  > db.restaurants.count()
  3950

6. Count by nested value
  > db.restaurants.find({"address.zipcode": "11206"}).count()
  15

7. Delete by id
  >  var resId = db.restaurants.findOne({})._id;
  > db.restaurants.remove({_id: resId})
  WriteResult({ "nRemoved" : 1 })

8. Update a single document
  > var newresId = db.restaurants.findOne({})._id;
  > db.restaurants.updateOne({_id: newresId}, {$set: {"name":"Bizz Bar Bang"}});
  { "acknowledged" : true, "matchedCount" : 1, "modifiedCount" : 1 }

9. Update many documents
  > db.restaurants.updateMany({"address.zipcode": "10035"}, {$set:{"address.zipcode": "10036"}});
  { "acknowledged" : true, "matchedCount" : 12, "modifiedCount" : 12 }