Why there are global high-pressure belts on Earth?

This is because the air around the equator gets heated and rises, forming a low pressure system which extends from 0- 10 degrees N and S. The air then moves out of these lows towards the poles, resulting in high pressure systems around the lower latitudes (around 20 degrees N and S), causing the desert systems in Australia and Africa. The air once again moves out of these high pressure belts to the next low pressure belt, which is located around 60 degrees N and S. These bring the rains to northern Europe and heavy snowfall and precipitation to the Antarctic coast. Lastly, the polar high pressure belt is locates at around 90 degrees N and S, which is why Antarctica is classified as a desert. So the reason for all this is because the warmth of the equator causes air to rise, forming a low. The air then sinks, forming a high. As the air moves out of the high, it rises as it has been heated by the land, and forms the next belt of low pressure systems. Finally, the polar highs are caused as the air moves out of the lows and sinks. There is more to this, including the Coriolis effect which causes winds and is due to the rotation of the E arth, however I don't understand that either :) Sources: geography classes