db.students.insertOne({"Name":"Ganesh","Age":20});
db.students.insertOne({"Name":"Mayank","Age":17});
db.students.find();

// NESTED DOCUMENT...........................................

db.students.updateOne({Name:"Ganesh"},{$set:{idCards:{haspancard:true, hasAdharcard:true}}})
db.students.findOne({name:'Ganesh'})
db.students.updateMany({},{$set:{hobbies:['Anemy','cooking']}});