The world of Web start with HTML ☀️
It's the bare bones of any webpage you see today, think of it as chemical element in the real world.
Each element has its own property and limitation, but by combining different elements, we can carry out unlimited possibilities.
Same apply to HTML elements (tags🏷️), each tag has its own set of attribute and responsibility. Then as Web developers, we combine and play around those tags to create what we want visually.
magic practice, we can make anything possible 😉.
Here is the cheat sheet of the most common tags you need to build anything!
W3Schools - Intro to HTML
W3Schools' materials is pretty hands-on and easy to read, just doesn't look as good.
If you perfer a step by step guide, this is a pretty good one too.