Localhost is the compound word for "local" and "host". Translate in the IT sense is your computer, Host in the sense that IT is the server. So localhost means a server running on your computer.
If you have read this article, let me guess ... What, you are looking to learn about WordPress and how to use it? It's not hard to master WordPress, but before learning how to conquer it, it's good if we can understand WordPress.
If you want to learn how to make your own professional website. And if you want to learn how to create a website using WordPress, the tutorials in this series will be for you, including those who do not know what wordpress is.