Let’s connect the LDR.

One leg to 5V, one leg to A0.

Now let’s WRITE some code.

(No. No copy-paste here…)

// Block 01 : DECLARE
// Name pins we use
// What pin? ; Name ; type ; const
const int LDR_PIN = A0;
// Block 02 : INIT
void setup() {
  // Start serial terminal
  Serial.begin(9600);
  // Set declared pins
  pinMode(LDR_PIN, INPUT);
}
// Block 03 : RUN
void loop() {
  // What do we do? input-read; output-show; delay
  // Analog values? 0 - 1023
  // How do we input / read?
  // What KIND/GROUP of pins?
  // What pin?
  // To where?
  // What TYPE is ldrValue?
  int ldrValue = analogRead(LDR_PIN);
  // How does Arduino TALK to us?
  // PRINT from Arduino to SERIAL "terminal"
  Serial.print("Light Level: ");
  Serial.println(ldrValue);
  // How do we delay? Wait?
  // Why 500? delay works in ms.
  // Print every half a second
  delay(500);
}
// Block 04 : LOGIC
// Nothing here yet…