i cant understand on how do you construct the three different CSS on html file?

skull ring

New member
inline styles sheet
external style sheet
internal style sheet
i have a tutorial lesson on wc3.com but i cant understood.
is this when you say internal style sheet it is inside html or new text document?
here it is i cant figure out how to build CSS that use these three kind it my defense on research work in english.
External style sheet – An external style sheet is ideal when the style is applied to many pages. With an external style sheet, you can change the look of an entire Web site by changing one file. Each page must link to the style sheet using the <link> tag. The <link> tag goes inside the head section
<head>
<link rel=”stylesheet” type=”text/css” href=”mystyle.css” />
</head>

In a new text editor this is CSS file for your html. Example:
hr {color:sienna;}
p {margin-left:20px;}
body {background-image:url("images/back40.gif");}
Internal style sheet - An internal style sheet should be used when a single document has a unique style. You define internal styles in the head section of an HTML page, by using the <style> tag.
<head>
<style type="text/css">
hr {color:sienna;}
p {margin-left:20px;}
body {background-image:url("images/back40.gif");}
</style>
</head>

Inline Styles - An inline style loses many of the advantages of style sheets by mixing content with presentation. Use this method sparingly! To use inline styles you use the style attribute in the relevant tag. The style attribute can contain any CSS property. The example shows how to change the color and the left margin of a paragraph
<p style="color:sienna;margin-left:20px">This is a paragraph.</p>

please give more elaborate on how because im going to have a live in classroom to construct that on notepad.
 
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