My question involves real estate located in the State of: CT

Hello all. Sorry if this is in the wrong part of the forum. I own a residential property which has an easement on one side which give access to a land locked property behind me. The neighbor and I do not get along. I have had cctv cameras set up for a while now for many reasons.

I am trying to find out the answers to a few questions.

Can I legally record him or anyone that comes on and off the property?

I read that to record audio, it is illegal under federal law, true? If so how does that work with blink and ring?

Do I need some sort of "security camera" sign on the property somewhere, kind of like a beware of dog?

Can I post any footage online as its on private property? Or will that violate his rights? For example, if he is harassing my family and the police do not want to act, can I put it on social media?