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 で I2C / 各ピン の役割 - yoshiyuki's blog
Connecting Two Nano Every Boards Through I2C | Arduino Documentation | Arduino Documentation