I bought a kit and I'm starting to study about it, I'm trying to do a test with the 16x2 + I2C module display, but it does not show the text on the screen, only the backlight comes on. I am using this project from the link below as an example
There are 2 things that you must know to be able to set up an I2C display. The I2C address and the I2c expander to LCD pin to pin wiring. If your constructor has the wrong address and/or wiring the display will not work.
The hd44780 library will automatically detect both the address and wiring. The documentation has installation instructions and many examples. The ioclass that is for your display is hd44780_I2Cexp.