Raspberry Pi Pico Pinout Reference – Which GPIO Pin to use?
https://microcontrollerslab.com/raspberry-pi-pico-pinout-features-programming-peripherals/
WEBThe following picture shows the pinout diagram of the Raspberry Pi Pico development board. It provides a total of 40 pins including, 26 GPIO pins, eight GND, 3 debugging, and Vcc pins. The color marking at the bottom end of this pinout diagram shows Power, ground, UART, GPIO, PWM, ADC, SPI, I2C, system control, and Debugging pins.
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