about lists:

• List item 1.
• List item 2.

  Paragraph contained in list item 2.

  • Sub-list item 1.
  • Sub-list item 2.
• List item 3.

First paragraph has its first line indented by four spaces. Then the author did not even bother to indent the other lines of the paragraph.

Second paragraph contains several lines which are all indented by two spaces. This style is much nicer than the one used for the previous paragraph.