CSS stands for Cascading Style Sheets, and it's a styling language used to control the presentation of HTML documents. With CSS, you can control things like the layout, colors, and fonts of a webpage, as well as add more advanced features like animations and responsive design. There are many tutorials for learning CSS (Cascading Style Sheets), which is a stylesheet language used for describing the presentation of a document written in a markup language.
Here we have list down CSS tutorials which will help you get a good understanding of the basics of CSS.
There are a lot more things you can do with CSS, but this should give you a basic understanding of how it works.
Let us know through feedback if you have any question about the above or specific topics you would like me to go over more in-depth.