Hello new student!
If you've never written a line of code before, this course may catch you off guard as I start assuming you've previously ran a create-react-app!
You need a few things:
Install here: https://nodejs.org/en/download/
Install yarn here: https://yarnpkg.com/en/docs/install#mac-stable
From here, we should have all the commands we need to install the create-react-app command on our computer. So you should check out the official documentation on how to install create-react-app here. https://github.com/facebook/create-react-app
3) create-react-app - A package which gives you the ability to run the create-react-app command. Once you have this installed, you can run it from your Terminal to create a new React.js project.
So to summarize, you download Node.js, install the create-react-app package globally on your computer through npm or Yarn, and using your Terminal and Text Editor, run the command to build your React project, and then open and modify files with your Text Editor.
This is all part of "setting up our development environment". You should Google everything here, watch Youtube videos, read articles, and try to learn how developers set up their environment. It is a very common conversation topic among web developers, and all these tools are very standard, I'm not doing anything unique or special with my setup.
So, part of the job is being resourceful and learning on your own, and so you should try to learn these tools from multiple sources. At the same time, while the setup is important, its just a means of creating and modifying files on your computer.
The learning never ends here! Let me know if you have any questions.