Grad student. I will ask you for a source. Sorry in advance

Hello. I am a few years into a graduate program in Ithaca and I have been reading this site for a couple of weeks before making an account, which I gather is the polite thing to do. I should warn you about my one annoying habit: when somebody states a number or a rule as though it is settled, I am going to ask where it came from. It is not scepticism aimed at you personally, it is just that I spend my working hours being asked the same thing and it has rewired me. Half the confident claims I have read online this month contradict the other half, so somebody has to ask. In exchange I will do the reading and post back what I find, including when it turns out I was the one who was wrong.