Amazon.com: SparkFun Qwiic HAT for Raspberry Pi -Connect I2C sensors & accessories to a standard 2x20 GPIO header Pi Tin compatible 4 Qwiic connectors Daisy chain sensors & accessories Useful GPIO pins
5pcs 2 X 20 Pin Male Gpio Header For Raspberry Pi Zero Double Row 20 Pin Male Pin Gpio Connector Colorful Stacking Header Extend - Demo Board Accessories - AliExpress
Simple Guide to the Raspberry Pi GPIO Header - Raspberry Pi Spy