Find code and diagrams at: https://www.elithecomputerguy.com/2019/07/i2c-20-x-4-lcd-display-on-arduino/

I2C Control Boards allow you to connect an LCD Display to your Arduino using only 4 wires.

Note: I2C is an Addressable Communication Protocol. 0x27 should be the default address of the display. If this does not work you will have to find the address by running a sketch designed to find I2C address on an Arduino: https://playground.arduino.cc/Main/I2cScanner/

Links:

New Liquid Crystal Library – https://bitbucket.org/fmalpartida/new-liquidcrystal/wiki/Home
Liquid Crystal I2C Library – https://www.arduinolibraries.info/libraries/liquid-crystal-i2-c

Functional Parts in the Project:

Arduino Uno – https://store.arduino.cc/usa/arduino-uno-rev3
20 x 4 I2C LCD Screen – https://amzn.to/2JVuKzn
560 Piece Jumper Wire Kit – https://amzn.to/2MsCLjL

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