Start with the series premiere — Season 1, Episode 1 — and watch in release order. House of the Dragon is serialized: the early episodes set up the Viserys–Rhaenyra succession conflict and the court divisions that drive the story, so starting at the beginning gives the clearest payoff.
If you want, I can give a short non‑spoiler primer on the main characters or suggest which early episodes are most essential.
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