You've organized the basics really well and quickly. ㅠㅠ Your questions have also been clearly resolved. Thank you~~~

yunbora5042605

For beginners and web developers, HTML and CSS feel unfamiliar and vast. 
In particular, CSS is also an object of fear(?) for developers. 
However, if you know the principles and core contents of HTML and CSS well, you can relieve some of those worries. In this lecture, you can learn the important concepts of HTML and CSS through source code.

crong4843

Core guide for HTML, CSS development

입문

초급

중급이상

HTML/CSS

Designing a website structure using HTML

CSS Basic Concepts and Rendering Principles

How to apply CSS basic styles

Layout settings

Programming CSS with LESS

Implementing animations with essential CSS3 properties