Learning CSS is still an uphill battle as no one knows every CSS property, but mastering little by little, has made me an incredible developer. So much so that this website was built entirely by me with React, HTML, and CSS! Without CSS, you can't use HTML to its full extent, and without HTML, you can't use CSS to its full power. As the old analogy goes, CSS is the skin, HTML is the skeletal structure, and js is the nerves and muscles that enable the person to perform actions.