-With $ npm install we install the dependencies in the node_modules / directory, for the node project you are working on.
-$ npm run build allows you to do any preparation / build tasks required for your project, before it is used on another project.
-First we write $ heroku login
-Then we write $ heroku create app-products-react
-And we type the following to associate git with Heroku $ heroku git: clone -a app-products-react
-We add the changes $ git add .
-We write a representative message of the commit $ git commit -am "deployment app react"
-Finally with this command we deploy our app to Heroku $ git push heroku master and happy code :)