How many camps were built during world war 2?

There were thousands of camps all over Germany a long time before they started building the true death camps. If you tap in concentration camps into any web search engine, it will show you a map of the camps. They were not all death camps, but were camps for Germans who were not Nazi's, and were used for, what they called 're-training'. IF you were released, and still able to think or even walk, you made sure you followed the rules and joined the 'Nazi Party' and kept your thoughts, to yourself in future.