Elemental theory of logic, we can believe

point :

   1⃣ we use logic to certificate theory True or False
   2⃣ if logic is not common Truth, we cant share outcome of certification
   3⃣ then we cant doubt logic, that use to certificate True or False

what kind of logic & meaning, that use to certificate True or False ?

   1⃣ And, or, in our certification 
   2⃣ True & false 
   3⃣ if (hypothesis) 
   4⃣ then

   writer recommend not to read 1⃣2⃣3⃣4⃣ because we usually know that. 
   we can trust 1⃣2⃣3⃣4⃣ = Elemental theory of logic,
   because we cant deny logic if logic not exist.