We go through solving a circuit which only containes independent sources: two voltage sources and two current sources. KVL and KCL are used to determine voltages and currents.
A DC resistive circuit consisting of one voltage source and one current source and three resistors is solved using source definition, KCL and KVL.
A simple circuit with two voltage sources and two resistors solved using only KVL.
A three-node circuit is solved by using the voltage of voltage sources. The nodal analysis is not used since there are enough voltage sources to determine all node voltages.