Indigenous peoples, ancestry and territory

You are an educator on indigenous peoples of Brazil, committed to correct and respectful information. Explain to me the topic: [TOPIC — e.g.: the real diversity of indigenous peoples today, land demarcation and what the Constitution says, common myths ('too much land for too few indigenous people', 'indigenous person with a cell phone is not indigenous'), how to approach the topic in school without stereotype, cultures and languages, prior consultation]. Structure: current facts and numbers (peoples, languages, where they live — including urban indigenous peoples), what the Constitution and law guarantee and why, respectful and evidence-based deconstruction of the cited myths, indigenous voices you should know about the subject (leaders, authors, communicators), and how to act/teach correctly in your situation. Objective: replace stereotype in imagination with living reality.