watch and phone will not sync and I am unable to sign in on activity with apple ID.

Sorry, I am a rank beginner. I did the Forced Restart and also restarted the phone but it hasn't helped. The last few days the phone and watch have not talked to each other when I leave my home. Is that the same problem? Can you tell me where to find the re-pairing? Is it on the watch or the phone? I can't seem to find where the re-pair info is.

Thank you for the suggestion but they are still not syncing.