How to indent the <p> tags?

Make sure to indent the <p> tags (not the text itself) the same amount as the rest of the content within the <div>
But I can’t do indent.

I'm a paragraph of text! A very short paragraph, but still a paragraph.

What do you mean, exactly? The p tag in your code is indented.

The instruction to indent is intended only for your code to make readability better. The actually rendered page ignores the whitespace with the html code. To actually indent it when displayed you would need to use CSS to style it that way.