The Dawn of Everything: A New History of Humanity is amazing, as is Debt: The First 5000 Years, but if their length is daunting, davidgraeber.org has a bunch of great articles and papers he’s done. I like “Are you an anarchist? The answer may surprise you!” And “The Practical Utopians Guide to the coming collapse”, but it’s mostly all worth reading. He has a lot of great lectures on YouTube also, if that’s more your style, and a few longer form interviews on podcasts like SRSLY Wrong.