Question: What do these show terms mean? (show bill attached)?

I have been riding for a long time, but I have never shown hunter/jumper. My friend has convinced me to go to this show with her but I am having trouble picking why classes to enter. I know the difference between hunter and jumper but I am not sure what some of the other terms mean. My horse is pretty new to jumping, he currently does around 2'-2'6" http://ift.tt/1cajz31 Here is a link to the show bill



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