Twelve lessons on the immersive and emerging audio formats every video product team will face this decade. We compare Dolby Atmos, Sony 360 Reality Audio, MPEG-H 3D Audio, ambisonics, and AOMedia's open IAMF/Eclipsa, walk objective audio-quality measurement (PEAQ, POLQA, ViSQOL) and subjective testing (MUSHRA), then close with a forward-looking view of neural audio codecs, AI-driven audio enhancement, and the next 5–10 years of the spec roadmap.