First, ensure you have node installed on your system. Then, run
npm install to install the project's dependencies and
npm run build to build the bundle. Finally, open
index.html in your favorite browser.
Having multiple copies of React in your bundle can cause problems. Lock was built using React, and if your project, or any other dependency, also depends on React, you might en up with two different versions in your bundle. In such scenarios, you should see a warning when doing
npm install. Also, you can check with
npm ls react at any time.