We gonna talk about side slipping, it's a very useful exercise
basically you have to check your position at the start
make sure the body is centered & forward
with the weight distributed on both skis
slightly a bit more on the downhill ski
move forward to get a little bit of momentum on your edges
and then flatten your skis and let them slide sideways nicely
then slide again and grip again
make sure you're using knees and hips at the same time
you have to make sure that the body is well centered on the skis to be able to do a proper sid slipping
don't start with the knees close togheter, otherwise you'll be catching the uphill ski edge
and to stop you just go back onto the edges with this movement of knees and hips into the hill.
I hope this will help, see you next time!