ng new my-dream-app
cd my-dream-app
npm install --save bootstrap  (for bootstrap)
ng serve

To include bootstrap open file .angular-cli.json and into styles array insert

 "../node_modules/bootstrap/dist/css/bootstrap.min.css"

Now go to http://localhost:4200 and you will see your app.



It may happen that you are changing files, but ng serve isnt detecting it, so your app isnt reloaded with changes. In this case do this:

sudo sysctl fs.inotify.max_user_watches=524288
sudo sysctl -p --system

The problem was related with Inotify Watches Limit on Linux. To solve to issue I increased the watches limit to 512K