Replying to Beginner to photography and shooting video

Hi guys, so im a beginner to the whole photography and video shooting scene. I took a photography course in highschool before which taught me the basic composition and settings on a dslr. I know how to take photos in complete manual mode. My question is when you guys take skiing photos do you have your camera set up in fully manual or do you use automatic settings? I find it a lot quicker to just flip it into automatic mode but then again I know you have more control over the camera in manual. If you guys have any tips on how I should start shooting in manual mode or if there is a point in manual at all that would be great. I am using the Nikon D5100.

Also for shooting video do you guys usually shoot on manual or automatic? any camera settings and tips for getting started would be great. Im looking for the best quality pictures and video. Sorry if I sound like a complete beginner.. Im just trying to get started lol.