as logic needs some basic assumptions in order to operate we assume some things then based on them we use logic to extrapolate. I think that there is no "fact", we all agree that some things are self evidently true for us, this is considered a fact. So at the most basic level lv 0 we believe nothing, no assumptions exist. lv 1 .( what are the basic things almost every being with self awareness will agree on?) lv 2 , ( what are the things all "sane" humans agree on, ) etc.....
I would like to know the least number of basic ideas we have to take on blind faith (assumptions) so that we can extrapolate the remaining ideas. If I have made any mistake in my understanding or if you have a conflicting opinion please let me know.