HTML stands for Hyper Text Markup Language and it is the standard markup language for Web Pages.
CSS stands for Cascading Style Sheets and it describes how HTML elements are to be displayed.
There are many topics to learn in CSS which are probably never ending. You can skip for now and these are enough if your aim is to become Fullstack Dev. But if you mainly focus on being Frontend Dev then you will have to comeback later and learn few more important topics.
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