So what needs to be installed to use React JS? First off, you'll need a text editor. Our preference is for VS Code as it is open source, and it has lots of features that make a developer's life easy, including syntax highlighting, linting and auto complete. As you've probably guessed, there's a high reliance on dependencies. So our package manager, in our case, NPM, is needed. 

Therefore you'll need to download and install NodeJS, which includes Node package manager. To set up your application, there are two options. The first is the Zero-config option, and uses node package runner called create-react-app, to create a skeleton application, pack full of features and tooling for testing which is much easier than the other option. 

That other option is to set up manually. This requires to set up a bundling tool such as Webpack, a translation tool, such as Babel, testing tools, and all the other desirable stuff that we need to build a good application. Node JS, which includes NPM, the Node Package Manager, can be downloaded from nodejs.org, and has versions for all the major operating systems. 

Having downloaded node and installed it, I then have opened Visual Studio code and gone to the terminal to check that node and NPM are both recognized commands on my system. I've done this by using the minus V switch, which displays the version number. Having done this, I can now use the NPX command. This allows me to run a node package runner called create-react-app. 

And I'm going to use my first app as the name of my project. When I press Enter here, it will install all of the files and dependencies that are needed for me to get my first app, react application up and running. So now the installation is complete. I'll follow the last piece of advise that it gives to CD to my first app and type NPM start. This as you can see, opens up my browser and displays the default react app. And there we go. This comes from react application, as delivered by create-react-app.