How to do connections of 16x2 LCD display

/*
  LiquidCrystal Library - Custom Characters

 Demonstrates  how to add custom characters on an LCD  display.
 The LiquidCrystal library works  with all LCD displays that are
 compatible with the  Hitachi HD44780 driver.  There are many of
 them out there, and you can usually tell them by the 16-pin  interface.

 This sketch prints "I <heart> Arduino!" and a little dancing  man
 to the LCD.

  The circuit:
 * LCD RS pin to digital pin 12
  * LCD Enable pin to digital pin 11
 * LCD D4 pin to digital pin 5
 * LCD D5  pin to digital pin 4
 * LCD D6 pin to digital pin 3
 * LCD D7 pin to digital  pin 2
 * LCD R/W pin to ground
 * 10K potentiometer:
 * ends to +5V and  ground
 * wiper to LCD VO pin (pin 3)
 * 10K poterntiometer on pin A0

  created 21 Mar 2011
 by Tom Igoe
 modified 11 Nov 2013
 by Scott Fitzgerald
  modified 7 Nov 2016
 by Arturo Guadalupi

 Based on Adafruit's example  at
 https://github.com/adafruit/SPI_VFD/blob/master/examples/createChar/createChar.pde

  This example code is in the public domain.
 http://www.arduino.cc/en/Tutorial/LiquidCrystalCustomCharacter

  Also useful:
 http://icontexto.com/charactercreator/

*/

// include  the library code:
#include <LiquidCrystal.h>

// initialize the library  by associating any needed LCD interface pin
// with the arduino pin number it  is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal  lcd(rs, en, d4, d5, d6, d7);

// make some custom characters:
byte heart[8]  = {
  0b00000,
  0b01010,
  0b11111,
  0b11111,
  0b11111,
  0b01110,
  0b00100,
  0b00000
};

byte smiley[8] = {
  0b00000,
  0b00000,
  0b01010,
  0b00000,
  0b00000,
  0b10001,
  0b01110,
  0b00000
};

byte  frownie[8] = {
  0b00000,
  0b00000,
  0b01010,
  0b00000,
  0b00000,
  0b00000,
  0b01110,
  0b10001
};

byte armsDown[8] = {
  0b00100,
  0b01010,
  0b00100,
  0b00100,
  0b01110,
  0b10101,
  0b00100,
  0b01010
};

byte armsUp[8] = {
  0b00100,
  0b01010,
  0b00100,
  0b10101,
  0b01110,
  0b00100,
  0b00100,
  0b01010
};

void  setup() {
  // initialize LCD and set up the number of columns and rows:
  lcd.begin(16, 2);

  // create a new character
  lcd.createChar(0, heart);
  // create a new character
  lcd.createChar(1, smiley);
  // create a new  character
  lcd.createChar(2, frownie);
  // create a new character
  lcd.createChar(3,  armsDown);
  // create a new character
  lcd.createChar(4, armsUp);

  // set the cursor to the top left
  lcd.setCursor(0, 0);

  // Print  a message to the lcd.
  lcd.print("I ");
  lcd.write(byte(0)); // when calling  lcd.write() '0' must be cast as a byte
  lcd.print(" Arduino! ");
  lcd.write((byte)1);

}

void  loop() {
  // read the potentiometer on A0:
  int sensorReading = analogRead(A0);
  // map the result to 200 - 1000:
  int delayTime = map(sensorReading, 0, 1023,  200, 1000);
  // set the cursor to the bottom row, 5th position:
  lcd.setCursor(4,  1);
  // draw the little man, arms down:
  lcd.write(3);
  delay(delayTime);
  lcd.setCursor(4, 1);
  // draw him arms up:
  lcd.write(4);
  delay(delayTime);
}