Think of a home page as the starting point of a website. Just like the table of contents of a book or magazine, the home page in most cases gives an overview of what you'll find at the website. A website can have one page, many pages or a few long ones, depending on how it's designed. If there isn't a lot of information, the home page may be the only page. But usually you will find at least a few other pages.
Web pages vary wildly in their design and content, but most use a traditional magazine format.
At the top of the page is a masthead or banner graphic. Then there's a list of items, such as articles, often with a brief description. The items in the list are usually linked to other material at the website or to other websites. Sometimes these links are highlighted words in the body of the text or are arranged in a list just like an index. They can also be a combination of both.