If you have a MacBook and an iPhone, this is the guide for you; it will indeed be very easy to fully utilize Apple's capabilities by following this guide.
How to Set Up Passkey with iCloud
Click on Passkey
If you have a Mac, an Apple pop-up will automatically appear, asking you to create a new passkey that will be saved in iCloud Keychain and available on all your devices.
Click on Continue.
✅ Done!
Having trouble setting up a passkey? Check out this article for guidance.