Arduino Uno Pins - A Complete Practical Guide - The Robotics Back-End
Amazon.com: SparkFun Qwiic Shield Compatible with Arduino Nano-connect the I2C bus (GND, 3.3V, SDA and SCL) to four Qwiic connectors (two horizontally and two vertically mounted)-daisy chaining-Soldering Required : Electronics
arduino nano - Can two electronic speed controllers be connected to the same ground pin? - Arduino Stack Exchange
Arduino Nano 33 BLE Sense Pinout, Introduction & Specifications