The Bluetooth module wants 3.3v logic levels so that is taken into account. The image above shows a buffer chip doing the conversion, but the Fritzing schematic on the post uses a voltage divider.

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An Arduino is a microcontroller — a single board designed to control something and perform a specific task. Unlike a Raspberry Pi, you won't find anything resembling an operating system here ...

While the Arduino microcontrollers work fairly well on their own, they can take your projects to the next level once you pair them with ESP32 and Raspberry Pi Pico boards.