The evolution, the spectrum of poetry as I know it has been exponential since I started writing ( I was twelve, I will be 41 in a couple of months). From metered, iambic, or haiku to free verse and even terse verse, the options are nearly limitless. I say nearly only because I do not consider myself educated nor experienced to say more than that. I remember in school being taught strict iambic pentameter and despairing at one point because sonnets (while beautiful to read) were not my forte!
Funny You should mention sonnets (not funny for me, though)
as i wrote a crippled sonnet -- my first ever and my last ever as i struggle to rhyme, let alone arranging syllables with fucking feet in a line just rightly so.......
& although educated, i've never taken courses for writing or poetry and so i'm just muddling my way around here
often, with lots of mud on my face.