We all know what's real or not. no? And we know because? Well some stuff is just real, it's here. I can touch it, I can see it, so it must be real. no?
Maybe?
Well somewhere, sometime we learned what was real and what isn't.
Who said so? Where did they learn it?
The point?
We're actually all philosophers. Our ideas of reality are the ideas passed down from a couple thousand years of people trying to understand what reality is.
BUT
These ideas have been changing. and the ones we have in place today don't do such a good job. Most of us in the western world are basically Cartesian philosophers even if you have no clue who Rene DeCartes was, a lot of your thoughts about reality are ideas HE cooked up.
HMMM! ?? !! No way!! I know what's real and what's not !!! NOT!!