So, my question is - just how reliable is this? black-hat hackers are one concern of course, but given the revelations of snowden/prism/vault7, is it actually

So, my question is - just how reliable is this? black-hat hackers are one concern of course, but given the revelations of snowden/prism/vault7, is it actually just the case that we are, for all intensive purposes, living in a post-privacy world? Of course, I've taken some steps to try to help my own internet security, but even for the straight-forward threats, its difficult to know what helps what, and the magnitude of the benefit conferred. Are there perhaps any websites out there that provide comprehensive guides to building up internet security/privacy, with regular updates about what courses of action should be taken each each new database breach that becomes public knowledge?