Glide waxing is seemingly very simple. It boils down to melting wax onto a ski and then removing it. That's it. The video above teaches these basics, but the process gets more complicated as the level of competition increases.
The purpose of glide waxing is to make your skis faster. Paraffin glide wax penetrates the ski base making the base more hydrophobic and decreasing friction.
Kick waxing is both an art and a science. Kick wax is the wax that gives a classic ski the ability to grip the snow and allow the skier to move forward. Kick wax is temperature, moisture and snow texture dependent. As a skier and wax technician you have to use your experience to determine what wax or wax combination will work best for the conditions.