What have I spent my time on?

Yesterday someone told me about Billy Joel, LOL, I don't know who he is... And it is sooo easy for my brother to tell me any one singer in HK, whom I do not know... I know nothing about music... And this someone also talked about this No True Scotsman concept, is also my first time to hear... and yet someone else told about the "law of non-contradiction" and also the "one-and-many" problem... I know nothing about philosophy... And when I'm asked about CS questions, I know neither more than the other IT-er. What have I spent my time on? Random thinking?