circuitbasics.com has a nice tutorial on how to use a common Hitachi HD44780 LCD display on Arduino. Many of the functions available are discussed and shown in examples.
In this tutorial, I will explain how to set up an LCD display on an Arduino, and show you (with examples) all of the functions available to program it. The display I will be using here is a 16×2 LCD display that I bought for under $10 on Amazon. They can be very useful in projects that output data, and will make your project look a lot more interesting.
How to Set Up and Program an LCD Display on an Arduino – [Link]