Experiments

This is a section

This is a division under a section

This is a paragraph under a division under a section

This is a stand alone div

This is a stand alone paragraph

This is a stand alone header

This is a header in a division

This is a paragraph in a division below a header

This is a paragraph after a division.

Paragraph within a section

This is a paragraph.

div, p makes all font red within a paragraph or division. - selects all divisions and paragraphs.
div p impacts all paragraphs within divisions
div > p selects all paragraphs where the div is a parent
div + p means all paragraphs immediately after a division
p ~ ul means all ul elements that are preceded by a paragraph