A few small habits here will save you a lot of relearning later. It takes two minutes to get right.
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Good hand position isn't about looking fancy. It's what lets your fingers move quickly and comfortably without straining. Get it right early and it'll feel completely natural within a few sessions.
Sheet music labels fingers 1–5, thumb to pinky, on both hands. Thumb is always finger 1.
Rest your right-hand thumb on Middle C (find it using Lesson 1), then let fingers 2, 3, 4, and 5 rest naturally on D, E, F, and G. That's the starting hand position for most beginner pieces, including several of the tutorials on this site.