Helpful url 1.https://github.com/CleverProgrammers/nodejs-zoom-clone 2.https://medium.com/better-programming/how-to-deploy-your-angular-9-app-to-heroku-in-minutes-51d171c2f0d 3.https://devcenter.heroku.com/articles/mean-apps-restful-api#set-up-the-angular-project-structure 4.https://stackoverflow.com/questions/34498819/socket-io-works-with-localhost-but-not-on-heroku-server 5.https://codemeals.com/angular-tutorials/deploy-angular-7-app-to-heroku/