The best way to get started is to remix one of our Starter Makes
Thimble is divided by the right pane, which is a live preview of web page that you're creating, and the left pane, which is the HTML and CSS code that is putting the page together.
Hit the Remix button on a starter make and follow the instructions written in the code.
Pick different areas of the code to modify and see what happens. When you hover your mouse over certain areas of the preview pane, you'll see that the section of code responsible for that area is highlighted for you on the left side.
Learn more about the Remix button