The Arduino IDE provides a sample sketch with a simple program outline in a text window when you first open it. There are also a vast array of code samples under the File->Examples submenu item.

Raspberry Pi Pico programmed using Arduino IDE. 10:10 am April 1, 2021 By Julian Horsey. If you are interested in learning how to program the new Raspberry Pi Pico microcontroller, ...

The latest version of Arduino’s Integrated Development Environment (IDE), version 2.3.3, has just been released, and it brings a host of new features ...