You do not need closing paragraph markers, but they help to keep your bearings. This is a defined term. This is a second. Blockquotes indent text in to denote notes or sideline ideas, usually. Definition data tags also work.
Lists are fun.
This is a numbered list Small letters Lists are fun. You may have noticed lists are set off by spacing horizontally as well as vertically. And three rows down red white blue You can also have no border.