Some common types of poetry are the haiku, the sonnet and the free verse poem. While the haiku and the sonnet conform to their own established structures, there are few rules dictating the style of free verse poetry.
A haiku is a short poem consisting of three lines and 17 syllables. The first and last line contain five syllables each, while the middle line is made up of seven syllables.
A sonnet is made up of 14 lines, 10 syllables each. It follows the "abab cdcd efef gg" pattern of rhyming.
A free verse poem, as the name suggests, is free-flowing. It has no set meter and does not have to rhyme.