There are only a few places in the entire Platonic corpus in which Socrates claimed to know anything, at least as far as I have been able to discover:
1. “I claim to know nothing aside from erotic matters…” — Symposium, 177d. (Ta erotika could also be rendered variously, “erotic things,” “the erotic,” “erotic matters”)
2. “It is certainly not conjecture to say that right opinion and knowledge are different. There are few things I would claim to know, but that is among them at least…” — Meno, 98b
3. “Come then, tell me this, [Euthydemus] said: Do you know anything? Certainly, [Socrates] replied, many things, though trifling.” — Euthydemus, 293b. (The relevant objects of knowledge are qualified as polla, i.e. “many,” and as smikra, which is “small” or “unimportant” or, as I have rendered it in my translation, “trifling.”)
4. “I am wiser than this man, for neither of us seems to know anything great and good; but he imagines that he knows something, even though he knows nothing; whereas I, not knowing anything, do not believe that I do. In this trifling thing (smikron) then, I seem to be wiser than he is, because I do not believe that I know what I do not know.” — Apology, 21; (It must be said that this is the closest as Plato’s Socrates ever gets to saying, “I know that I do not know.” Literally, this is not what is said, although it is not clear how recognizing one’s lack of knowledge could ever be doubtful if recognized at all. Notice that this recognition of a difference between himself and the one claiming wisdom is also called a “trifling thing.”)
Is there some way in which Socrates’ few admitted objects of knowledge — (i) the difference between opinion & knowledge, (ii) erotic matters, (iii) many trifling things, and (iv) one’s own ignorance — are related in some way?
shared ignorance 
On the face of things, Socrates links the self-awareness of ignorance as a a trifling thing. I am not thoroughly versed in Platonic dialogues, but I imagine he would also consider erotic things as trifling. Maybe the difference between knowledge and opinion is the only non-trifling thing he knows. I often wonder if Socrates purposely avoids avowing knowledge or if he just recognizes that our ability to know is primarily through opinion and therefore can’t be clearly called knowledge. I wonder what sort of knowing he would say was not a trifling thing. I’ve been thinking about this for two days and this is as far as I’ve got.
Good thoughts on possible connections between Socrates’ professed “knowledges.” I will try to compile my observations in a post to come.
I just posted my own thoughts on the subject. Thanks for spurring me on!
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