This lab aims to teach you basic of web design using Hypertext Markup Language (HTML) which is a markup language for organizing content for web consuption. HTML, and it's counterpart CSS (Cascading Style Sheets) are the fundamental building blocks of the world wide web, and are used to build every single site you visit during your day.
Your computer is filled to the brim with vacation photos, music, movies, games and random documents. This must be why it is so slow, right? Wrong. Very, very wrong. While it is true that a hard drive that is about 99% full, may cause some problems, the amount of available storage space on your computer usually does not affect the performance. The primary function of a hard drive is to store and preserve your files. If this very function was being detrimental to the computer performance, it would be a very bad design flaw. So no, the piles upon piles of pictures and mp3s sitting on your hard drive do not slow you down. You gain absolutely nothing by deleting them.