What is the source of knowledge? True knowledge?

What is the source of knowledge? And I mean of true knowledge? Not just information. Not someone’s version of “their truth” or what someone else “knows”. But real, honest-to-goodness true knowledge. Remember when that used to exist? It hasn’t gone away. And it won’t go away, no matter how much we try to ignore it. But in today’s world of information overload, how can we find real true knowledge?