How to connect Apple Watch with iPhone?
How to connect Apple Watch in my phone
[Re-Titled by Moderator]
iPhone 6s, iOS 14
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Your tag line says you have an iPhone 6s. If you bought a new Apple Watch, you won't be able to pair it with such an old iPhone. Any new Apple Watch or one which already had been updated to WatchOS 9 will only pair with an iPhone which is running at least iOS 16 (current version is 16.5), which an iPhone 6s is not capable of running.
If this isn't your situation, see this link to learn how to pair a compatible Apple Watch with a compatible iPhone --> Set up and pair your Apple Watch with iPhone - Apple Support