This starter project is made to get you up and running quickly. It includes Tachyons, and a custom made toggleClass JavaScript function that you can learn how to use in the comments of the /javascript/toggleClass.js file.
To use this starter, simply download it. Be sure to rename the folder and make it a Git repository before you start working.
When working you should always start a local server so you can be sure that all of your links and image paths will work correctly when put you put your site on a web server. The local server only needs to be running while you're working — it is specific to your computer.
If you're using the Atom code editor, install the atom-live-server package. If you're not sure how to install packages in Atom, you can learn how in the documentation.
Your "home page" is index.html. You can as many .html documents to your project as you like.
Write your CSS styles in /css/main.css. All styles written there will override the included Tachyons styles.
Write your JavaScript in /javascript/main.js.