How tight should Apple watch band be?

Related questions

1. Do old apple watch bands work on Series 4?
2. Do old bands work on Apple Watch 4?
3. Will a 40mm Apple watch band fit a 38mm watch?
4. Does Apple Watch 4 fit old bands?
5. Can you change bands on Apple Watch?
6. How wide are Apple watch bands?
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8. Do Apple watch bands fit all series?
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