Solid edit. I think one of the main problems was over-exposing the snow, so try and fix that. You may want to try and color grade the shots. Another key point is to try and keep the skier in the shot the whole time. Some of the shots the skier was going out of the shots so I missed some of the trick. I also think you could have done a little less slow motion, but that's just my opinion. I thought the shots with the skiers names were quite nice though and the intro was title was pretty cool.
Well i don't know the exact definition but its when you make the the "shutter ring/hole thing (not so sure what the word is)" bigger or smaller the lower the f-stop the brighter your picture is going to be and the greater your f stop is the darker your photo is going to be