When snowboarding first became popular, riders were often restricted to certain parts of the mountain or not even allowed at the resort. Now that snowboarding is common, riders have access to every kind of terrain. The differences between riding steeps, moguls and glades, have to do with body positioning and speed control.
When you ride on steep terrain, you want to keep your body centered on the board. Bend your knees, and keep them in line with your shoulders, waist and feet. You gain speed very quickly on steep hills, but since there are few obstacles on these runs, you can carve long turns across the hill to increase or decrease your speed. If there are a lot of people on the hill, make short turns, digging your edge into the snow and pivoting your back foot back and forth. These "pivot turns" help you control your speed without taking up the whole hill.
Snowboarding on Moguls
Moguls exist at every ski and snowboard resort, and even if you didn't mean to go down a mogul run, you will probably run into them sooner or later. When riding moguls, you want to keep your knees soft and flexible. Get low in an athletic stance with your weight centered. You'll almost always use pivot turns for riding through moguls because they allow you to make acute turns and control your speed when needed. Keep your body low and knees loose at all times to absorb the impact of the bumpy ride.
Glades are the most difficult terrain among the three. They are a combination of moguls and steep terrain, but they also run through the woods, making trees a serious obstacle. You'll want to use the same pivot turns and soft, flexible knees you use through moguls to weave through trees in the glades. If you're riding through glades in a heavy powder area, you'll want to lean back on your board to lift the nose out pf the powder instead of keeping your weight centered.
Similarities and Differences
All of these types of riding require you to bend your knees and ride in an athletic stance. While you can make long, carving turns on steep hills, these types of turns aren't useful in the tight terrain of moguls and glades. Keeping your weight centered over the board is preferred for almost every style of riding, but when you find yourself in powder, you always need to lean back to glide over the snow and prevent yourself from getting stuck. Adjust your style of riding to fit each type of terrain, and you'll soon become an expert on all of them.