In one of the interviews I got to the panel stage and they asked me to present a topic of my interest, and being the reckless fool I am I decided to present about one of the company’s products which I’ve sold something similar in the past, thinking this will impress them. As soon as the Sales director that was interviewing me saw it, he said he's only seen 4 people do this in his 18 years interviewing career, and all 4 have failed (so much for making me feel even more nevrous than I was). Anyway, I carry on confidently presenting but somewhere down the line he asks me difficult questions which I failed to answer right, and like that I blew my chances with that company and moved on. Yesterday, I was at another panel interview where I was asked to present about the company's platform, a space I've got no knowledge about and they expected me to know all the features and benefits which I found really strange and for my lack of knowledge in that space I kept my presentation high level as I didn't want to start talking about things I knew little about in the fear that the same thing happens to me again!! (btw I also got rejected after doing the presentation as I didn't have enough knowledge).
My question to the war room, is this a common knowledge that you shouldn't choose to present about the company you're interviewing?
Thank you in advance