What is Gurbani’s definition of Nirgun and Sargun?

This require long answer but I be very brief. GURU NANAK says when there was absolutely nothing existed in the universe THE TIMELESS, SPACELESS AND FORMLESS SHABAD, JOYT, UNIVERSAL LIFE ENERGY, UNIVERSAL CONSCIOUSNESS existed itself. This was beyond any human experience, NIRGUN, TRANSCENDENT. This NIRGUN manifested itself as the universe we know. GURU says NIRGUN SIRGUN APAY SOEE ( SGGS PAGE 128) meaning this whole universe, SIRGUN, is the manifested form of IK ONKAR, THE ONENESS. GURU says we all come from IK AND ARE ALL CONNECTED.