We are going to consider only very basic features of HTML. For text formatting, you use special tags (markup elements enclosed between angular brackets).
Each paragraph should be enclosed in its own paragraph tag (p). A paragraph can span multiple lines: the browser wraps the lines automatically. Multiple whitespace characters and new line characters are discarded by the browser, so you have to rely on the paragraph tags to format the page.
The tag em can be used to emphasize certain phrases, the browser shows it with the italic typeface.