Set up VNC on Raspberry Pi

Raspbian operating system is already installed.

Install tightvncserver

sudo apt-get install tightvncserver -y

Launch VNC at the first time and enter password

tightvncserver

Create a service file

sudo nano /etc/init.d/tightvnc

Paste the content

#!/bin/sh
### BEGIN INIT INFO
# Provides: tightvncserver
# Required-Start:
# Required-Stop:
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: start vnc server
# Description:
### END INIT INFO

case "$1" in
start)
su pi -c 'vncserver :1 -geometry 1024x768 -depth 16 -pixelformat rgb565:'
echo "VNC Started"
;;
stop)
pkill Xtightvnc
echo "VNC Terminated"
;;
*)
echo "Usage: /etc/init.d/tightvnc {start|stop}"
exit 1
;;
esac

Press ctrl+x to exit, press y to select overwrite option and press enter to accept

Set service executable

sudo chmod 755 /etc/init.d/tightvnc

Recheck which service needed to launch at startup

sudo update-rc.d tightvnc defaults

Reboot the computer to test

sudo reboot

To connect yoru pi use ip address plus :1

Related:
https://www.howtogeek.com/141157/how-to-configure-your-raspberry-pi-for-remote-shell-desktop-and-file-transfer/2/