Answer 1

there are 3 days for doing so..
• Inline
• Embedded
• External

inline - use directly in the tags...
ex. <h1 style="color:red">Hello World!</h1>

embedded - input the css in the style tag
ex. <style>h1{color:red}</style>

external - including the css file from the directory
ex. <link rel="stylesheet" href="style.css">

https://www.sololearn.com/learn/CSS/1079/