Updated on 2017.04.29.
Parallel Interface: Getting Started with a JHD162A 16×2 display
I2C Interface: Getting Started with a J204A 20×4 display with I2C daughter board
Creating custom characters
HD44780 compatible LCDs come in many shapes and sizes and two very common ones are the 16×2 and 20×4 characters. Although most screens come with a back light some do not. And although the original interface is parallel some screens come with an I2C adapter/daughter board pre attached (you can buy the I2C adapters separately).