This is heading 1.
h1 is left justified, but h2-h6 are all centered. h1 is the largest font. Each successive heading number gets a bit smaller. h1 is all uppercase. There should only ever be one h1 heading on a page, and that should be the page title.
This is heading 2.
h2 is all uppercase. h2 and h3 are red.
This is heading 3.
h3 is a bit smaller than h2 and is red. It has both uppercase and lowercase.
This is heading 4.
h4 is bold.
This is heading 5.
h5 is bold and italics.
This is heading 6.
H6 is bold and centered. It is the same size as normal paragraph text.