Better ways to write asynchronous code in node.js

I am going to write asynchronous code in multiple ways. You can execute asynchronous code in callback way or promises way.I am going to implement one use case by using following patterns Callback way (callback hell) Async Library Promises Async/await USE CASE I have three tables or collections in my database. Product Order ProductOrder I am going to execute this flow and write asynchronous code in multiple ways. CALLBACK WAY (CALLBACKHELL) JavaScript 1234567891011121314151617181920212223242526272829303132333435363738394041424344 callbackHell(req, res) {     //Create new Product     Product.create({        name: 'MacbookPro',        qty: 123,        price: 10000.9    }, (err, _product) => {         if (err) return res.serverError(err);         //Find Order by orderNumber = 123         Order.findOne({            orderNumber: 123        }, (err, _order) =>...

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