A few people here at school have asked me to work with them on starting to play tennis. I'm not that great myself, but I told them I could help out hitting around. What do you guys think is the first shot that they should learn? I think the first real shot that I figured out, other than "aim for between the lines on the other side of the net," was a slice. It's a good defensive shot, and I learned from there. Any other suggestions (and I'm sure there are)?