App.js

var Tx = require('ethereumjs-tx').Transaction;
const Web3 = require('web3');
var url = 'https://kovan.infura.io/v3/1988f993df8140259d2198f3f33f3012'
const web3 = new Web3(url);

//Get an account address and it's private key
const account1 = '0xE6c5329453F4C650716B2dc04283A73e381c8750';
const privateKey1 = Buffer.from("a6d49d470bb92210fbefaa8f3037ca0b4e67806f0997dd4d75f5b25b7285d788",'hex');

//Get another account address and it's private key
const account2 = '0xDCAB519AD714639B6E911C179F3f25344ED93193';
const privateKey2 = Buffer.from("02795c427f76f5a7346b96c73c6e373256c7aed620c9da2125a03a5b78140101web3",'hex');
//'Buffer.from' converts string to binary data and we changed then to type hex

web3.eth.getTransactionCount(account1, (err, txCount) => {

        //since we need txCount to use in building transaction
        //so we defined it here
    
        //Build the Transaction\\

        const txObject = {
            nonce: web3.utils.toHex(txCount),
            to: account2 ,
            value:  web3.utils.toHex(web3.utils.toWei('0.3','ether')),
            gasLimit: web3.utils.toHex(21000) ,
            gasPrice: web3.utils.toHex(web3.utils.toWei('10', 'gwei'))
        }
        console.log(txObject);
    }
)

Above code is preety much self explanatory.

Then run this code from cmd using this code to see the transaction we build

node app

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!!!!!HAPPY LEARNING!!!!