I learned how to write Haiku and Limericks. Maintaining their structure is a bit of a challenge, but it forces me to think about the meaning of the words and the image I am trying to impart. The Sonnet form is still a bit out of my reach, but I'll get it eventually.
Free verse? My opinion is that anything that has no metre or rhyme is not poetry, but apparently some people are proficient enough to make a living writing free verse, whereas I could only come up with 6 or 7 new verses for "Here I Sit, Broken Hearted..." to add to the bathroom wall at school.

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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.