Dear student,
Qc = product / reactant
So when Qc > Kc , the product is more than the reactant. So for maintaining the equilibrium, the reaction will proceed in the backwards direction means reaction proceeds in the direction of reactants.
when Qc < Kc , the reactant is more than the product. So for maintaining the equilibrium, the reaction will proceed in the forward direction means reaction proceeds in the direction of reductants.
Regards,