In this course, we'll need to preview and test the apps we've created, and there are many ways to do this. To simplify, I've decided to use the Live Server Extension, which is a simple way to get started quickly. Alright, let's install the extension very quickly: Go to the Project Explorer and open the Extensions tab. You can also use the shortcut SHIFT + CMD + X or SHIFT + CTRL + X on Windows. In the Extensions tab, use the search function to type in 'Live Server' and install it. The Live Server is a useful extension that quickly launches a web server for previewing and testing our applications. You can start the extension from the bottom of the screen, by right-clicking on the desired file, or from the command palette when it is enabled. You can also stop the server if you want to stop working on your project. That is all. We will use the live server later.