The common theme to all these will be they are podcasts that started by winging it and then became huge and are very open about their process and above all entertaining to listen to.
1. Lewis Howes School Of Greatness
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2. Bertcast
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Comedian Bert Kreischer. Very funny podcast but the cool thing is he loves talking as he calls it "inside baseball" with other comics about their numbers and podcasts and how they create.