You should not attempt these lessons until you've completed our courses on HTML & CSS, basic and intermediate JavaScript as well as JavaScript in the Browser.
These lessons come with a set of starter files - just some prewritten HTML and CSS along with a blank JavaScript file. Download this package of code and unzip it. Then just open the files in your favorite coding editor, like Visual Studio Code:
◎ = Not Started
◉ = Started
✓ = Completed