There are subjects in which I have formal training and extensive experience in. Here I speak with authority and don't use slippery language; I may even cite sources.
There are other subjects that I read about once probably somewhere on the internet at some point in the last 25 years or so. Here I will phrase it as "If I understand correctly" or I might even pose it as a question inviting others to correct me.
I went to flight school during the time when we all thought System of a Down had recorded a song about the Legend of Zelda. If you don't have an internal rating system about how reliably you "know" the things you "know" you're probably not worth listening to.