ArduinoBLE central

Hi, I have a really hard time finding information on the arduinioble library. In my project i want to use two arduino nano 33 ble to communicate with each other using BLE. One will send data and the other one will print the data on a small LCD screen. The problem is that i am not able to find a good tutorial for central using the arduino nano 33 ble. I already tried the example of the library and been able to connect the two boards together, but I do not really understand the principle of sending data with BLE. I already read the arduino page on BLE but it didn’t help much. Where can I find the information I need?

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