When you know khajiits have spikes on their pencses. :facepalm:
It does not require a lore buff to know that, all you need is to read the Daggerfall version of the Real Baranzhiah, or just pay an occasional visit to the lore forum.
Anyway, how do you know you are a lore buff? I would say one way is if you know more about the history of Nirn than your own country's history.
If you have extensive knowledge of the Elder Scrolls cosmology AND it actually seems to
make sense to you.
You spend hours making up theories on the lore and posting them in the lore forum even though there is a good chance they will be proven wrong when the games actually discuss that subject.
Not our fault that a few writers managed to make half a dozen video games better than almost every mainstream fantasy novel ever written.
That's not saying much, considering that much of main stream fantasy is pretty much exactly like Middle Earth, except not as detailed and well thought-out.