1. Agriculture: This is the most widespread use of land, involving the cultivation of crops and the raising of livestock for food, fiber, and other products. It includes everything from small-scale family farms to large-scale industrial agriculture.

2. Urban Development: As populations grow and societies become more urbanized, more and more land is dedicated to building cities, towns, and infrastructure like roads, schools, and hospitals. This includes residential, commercial, and industrial areas.

3. Conservation and Recreation: Humans also use land for conservation and recreation. This includes setting aside land for national parks, forests, and wildlife refuges to protect biodiversity, preserve natural habitats, and provide opportunities for outdoor activities like hiking, camping, and fishing.

There are, of course, many other ways humans use land, but these are three of the most significant and widespread.