[Practical.vim (2012.9)]. DREW.NEIL.TIP47 Study Summary

Distinguish between Real Lines and Display Lines

Unlike many text editors, Vim makes a distinction between real lines and display lines. When the "wrap" setting is enabled (and it's on by default), each line of text that exceeds the width of the window would d Isplay as wrapped, ensuring that's no text is truncated from view. As a result, a single line in the file is represented by multiple lines on the display.
Differentiate between real lines and display linesin vim. For one text, if the length of a line of text is greater than the width of the display window, it is automatically changed to the next line to avoid truncation. So the original single line (real lines) is changed to multiple lines (display lines).

The easiest-to-tell the difference between real lines and display lines are by enabling the ' number ' setting. Lines that begin with a number correspond to the real Lines, which may span one or more display Lines.
Enter commands in the normal mode of VIM

:set number

You can display the line number of the text. The line that starts with the line number is real lines

Vim provides shortcuts to quickly move up and down in real lines and display lines , as well as fast jumps at the beginning and end of the line.

[Practical.vim (2012.9)]. DREW.NEIL.TIP47 Study Summary