What does a trust certificate do exactly. I am confused easily by techie talk. So plz dumb it down for me!!

You might want to consider changing your password and making sure it is a strong one. You can also add 2 Factor Authentication to your account for more security. If the attempts continue, you might want to consider a name change.

Apple ID has been compromised

 Apple ID Password Change

Note the restrictions in the article.

Apple ID Name Change

 What to do after you change your Apple ID or password - Apple Support     I suggest doing this before you change your Apple ID or password.

 Apple ID -Two-factor authentication

 Two Factor Authentification availability

 Apple ID - Using app-specific passwords

Apple ID - Two Step Verification App Specific Passwords

Apple ID - Two Step Verifications FAQ

It's simply a certificate the verifies you are trusted or that the computer you are connecting with is trusted. These are security precautions intended to prevent hacking. This is hardly tech talk.

"Also how do I disable unauthorized pairing to an apple device I have no access to when the device has access to ALL my ****. " I'm not sure what you mean. What devices are around you that are unauthorized and paired to one another? You have to clarify this situation - too much tech talk for me to understand.