Step 1: Schematic Diagram for SPDT and the Connections

This is the Diagrams about the connections.

First picture is the schematic diagram.

Second picture shows the connections with real components.

Step 2: Code

Code-

This the code for the program-

// Learn SPDT switch two-way with 2 LED
// Virtual Program (without Arduino) -> https://www.tinkercad.com/things/3uNGAyy7bvY
// Program-

int tp_no1 = 5; //pin when the switch is focused in terminal 1
int tp_no2 = 4; //pin when the switch is focused in terminal 2
int led_1 = 0; //LED for SPT&1
int led_2 = 13; //LED for SPT&2
int value_1 = 0; //value for SP&T1 (F/A)
int value_2 = 0; //value for SP&T2 (F/A)
// mostly 'Away' is default and we keep it's value as '0'. Value 1 is 'Focused'.

void setup () { //pin setup
  pinMode(led_1,OUTPUT);
  pinMode(led_2,OUTPUT);
  // LED pins are OUTPUTS.
  pinMode(tp_no1,INPUT);
  pinMode(tp_no2,OUTPUT);
  // Non-power supply pins of SPDT are INPUTS.
  Serial.begin(9600); //Start Serial Monitor at 9600 br.
}

void loop () { //main code
  value_1 = digitalRead(tp_no1); //Value becomes the Switch value (Throw 1)
  value_2 = digitalRead(tp_no2); //Value becomes the Switch value (Throw 2)

  if (value_1 == 1) {  // if throw to end 1 is focused and throw to end 2 is away.
    digitalWrite(led_1,HIGH); //LED 1 is on (as the switch is focused to it's end)
    digitalWrite(led_2,LOW); //LED 2 is off (as the switch is away from it's end)
    Serial.println(1);
  }
  else if (value_2 == 1) {  // if throw to end 2 is focused and throw to end 1 is away.
    digitalWrite(led_2,HIGH); //LED 2 is on (as the switch is focused to it's end)
    digitalWrite(led_1,LOW); //LED 1 is off (as the switch is away from it's end)
    Serial.println(2);
  }
  else { //if both dosen't work (that'll only happen 1%)
    Serial.println("Error");
  }
}