Deserts can be studied according to their climate, geographic location, landscape, and precipitation patterns. This makes desert geography more diverse than the common image of a hot region covered by sand.
Major examples include the Sahara, Gobi, Arabian, Great Australian, Kalahari, Patagonian, and polar deserts.

For an introductory reference, see this resource on desert geography explained, including major desert regions and their key characteristics.
https://thecampusreview.com/geography/largest-deserts-in-the-world