I agree that epistemological modesty is very important, but my own view is different from that of Socrates. I claim to know many things (and I think that the average person knows many things), but I do not claim to know much (if anything) with certainty. Knowledge, being nothing more than true belief supported by strong argument or evidence, is actually not that hard to come by I believe. Certain knowledge, on the other hand, is extremely rare (if it exists at all).

The key, I believe, is not to deny knowledge, but rather to realise that you might be mistaken. According to the view called fallibilism, you should hold your beliefs only provisionally and always be prepared to re-evaluate any position that you hold and to revise it whenever the new information warrants it. I wrote about this in my first post on Steemit: https://steemit.com/introduceyourself/@morality2/morality-version-2-0-joining-the-new-marketplace-of-ideas