Got 2020 MacBook Pro.

What is the best way to secure the network and what router or modem would sugtgest versus the Spectrum ones I have. I have had this earth globe icon in my files righ beside the hard disk and its labeled Network.... can't get any info out of it besides it says neighborhood and that's that. I still have the Network icon and found a way to get rid of the neighborhood label. But im thinking there was a guy with first moved to the neighborhood and passed out all these little flyers for everybody to go to this site and register in the neighborhood and everyone could communicate and safety blah blah. We live in a nice neighborhood but not that many houses and there's a cornfield and a beanfield around us and my kids ride their bikes to school that's a half mile away in a field. Not like im in little Harlem. Anyway I think these people somehow got the Neighborhood on my mamboed and have had access to all my stuff.