The whole point of this poem is to demonstrate how weird and challenging English pronunciation can be. I think it's a good tool for picking out words that you might not realise are pronounced in a certain way, so if you do pick your way through that poem there are plenty of words in there which would be very useful for you to really learn how to pronounce correctly. Now I'm just checking on my phone because I found a couple of other quite interesting images about English pronunciation which I will add to this episode.