what are the three different camps people lived in?

They park in a camp and they meet a man, a returning migrant from California, who laughs at Pa's optimism about conditions in California and who speaks bitterly about his awful experiences in the West.

The Joads make way to another migrant camp named the Keene Ranch. After doing some work in the fields they discover the high food prices in the company store for meat and other products.

The third type of camp: Farmworkers' Wheat Patch Camp (Weedpatch in the book), a clean camp run by the Department of Agriculture, complete with indoor toilets and showers, which the Joad children had never seen before. After Tom becomes personally idealized by what he has witnessed in the various camps, he describes how he plans to carry on Casy's mission in the world by fighting for social reform.