The two basic kinds of lists work the same. You use {ol} to start an ordered list (one with numbers on each item) and {ul} to start an unordered list (one with bullets for each item). The items themselves are begun with an {li} which is short for list-item). You use {/ol} or {/ul} to finish the list. Normally, you don't need anything to end the {li} since you're either starting a new item or ending the list. However, {/li} can be useful if you want to insert some "regular text" between two items in a list.
Present an ordered list:
First item in the list
Next item in the list
. . .
Last item in the list
Present an unordered list:
First item in the list
Next item in the list
. . .
Last item in the list
Note that {dir} and {menu} function on most browsers the same as {ul}. If you use {dir} keep the length under 20 characters for each list-item.