HTML (HyperText Markup Language) is the programming language used by browsers to render the webpage. It is an essential language that all web developers must know.
The content of a webpage is a collection of HTML elements.
There are many different types of HTML elements. Some elements show text, others show images and videos, and another class of elements are used to control the layout of the webpage.
Becoming an expert in HTML requires you to know the most popular HTML elements and how they function.
Resources for learning more about HTML