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There is no simple explanation that is also comprehensive.
Start with the two red levers between the seats. If they are down on the floor, the heat should be off. The rotary switch between them should be a "0" to be off as well.
Raise the driver's side lever to increase heat to that side of the cabin. Guess what the passenger's side lever does???. The rotary switch can increase airflow via fans.
On the instrument panel (aka dash), the levers are used to direct heat to the floor or windshield as needed. Other levers there introduce outside air into the cabin. And if your car has A/C, that is in the console and a third, independent system.
There are some posts here with a lot more detail and pics of the levers, switches, etc.
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