So, last assignment, class #2, we created our site and created the hierarchal folder structure for the site. We added an index landing page and then an index to our exercises folder. Remember, if you look at mine, I don't label mine as index in the excersise folder, I label it as exercises.html as that page for that folder.
If you are on this landing page, click on the folder icon and you will see the hierarchy you should have for class #3 assignment