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Thanks! I sent you a longer private message in response.
"The top of the Potential Divider is 5V; the bottom is at 0V and the middle (connected to A0) is some value between 5V and 0V that varies as the LDR resistance varies. Remember the LDR resistance varies with Light so the Voltage at A0 will too."-The article already states that as the LDR resistance varies, the voltage at A0 will vary too. If the voltage already varies with the varying resistance of the LDR, why do we need the 2nd resistor to vary the voltage if that's already happening without it??