Loca list stores data in your browser.

npm start runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.

npm test - launches the test runner in the interactive watch mode.
See the section about running tests for more information.

npm run build - builds the app for production to the build folder.
It correctly bundles React in production mode and optimizes the build for the best performance.

node ./node_modules/serve/build/main.js -s build -l 3001 runs the build.