dot dot gov?

as the title is. what is that? and how do i use it? i know cia.gov

but people talk about using google.gov or something, that is not working for me atleast.

So where do i need to go to get the real deal?

i hear dot dot gov on most of the conspiracy channels i listen to what the f is that? becuse i have seen the change in search result past years how do i find the most relevant?