Ski tuning is an essential part of ski racing. Most important videos are RED.
Failing to take care of ski edges will result in less grip on the snow and increase the potential for injury.
Take some time and watch these videos if you aren't sure how to take care of race skis (or any ski for that matter).
Your coach should be able to clue you in on tuning and waxing; at least after watching these you should know the lingo!