Learn the basics of HTML
The computer language for which all websites are built off of is called Hypertext Markup Language, or HTML for short.
Every website, no matter how big or small or its type, uses HTML as the foundation for which it was designed from. When I first learned web design, you had to know and understand HTML in order to build a website.
Fortunately, that is no longer the case today. Today, you can use WordPress to build websites, which is the most common web building platform out there today.