How to use GPIO or UART ports?

Hello to everyone, I am newbie on Elecrow HMI Displays and I have a probably a simple (for you sure) question.
Suppose I have any sensor/board that uses GPIO port or UART interface of an HMI display, can I use this sensor/board with only using Elecrow's ports over or do I need to use an extra device with microprocessor?
If so, is there any tutorial/video/documentation about using Elecrow HMI Displays with hardware? Because nearly all tutorials are just about the design of HMI with SquareLine Studio and compile to Arduino IDE.

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