You’ll start by creating multiple HTML pages. They can be in the same folder, or in their own folder, it doesn’t matter, you just need to know where to point to them. Then, you simply make A tags to point to them. In HTML, when referencing a file, beginners tend to make 2 mistakes – they don’t spell the file name right (or use capital/lowercase letters on accident) OR, they don’t point to the right location for the HTML/CSS file. If the HTML or CSS file is in a folder, you need to reference the folder as well.
Also watch: “Responsive Design Tutorial – Tips for making web sites look great on any device”