what is the look-significance of "list-style-position" tag? why should I use that?

Answer 1

that lets u use the style in manner you wanted to display.better understand the concept when use with tables

Answer 2

ouside will set numbering like it has alignment to the right and inside will make numbering a part of the text.
try using list-style: upper-roman; and then try switching between inside and outside.

Answer 3

what is margin ?

Answer 4

margin is, how much space u want to left in webpage....