You can open an HTML file in your browser, but typically it's hosted on a webserver.
Your CSS, JS, and images could be in different directories, and using the correct paths becomes difficult without a common site root.
Online Code Editors
How do you run the code you write? To gt started with html/css/js you can try an online editor like CodePen that will show you the results of your code.
Local Development Environments
If you need to run an application like WordPress or Drupal that depends on having server software installed like PHP and MySQL, you need a way to set this up on your computer to work with the code.
This class will give an overview of local development environments and some common things you need to configure in order to work on your projects.
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