: Support for Arduino shields and ST morpho headers allows developers to easily add specialized hardware add-ons.

Because they share the Arduino-compatible layout, Nucleo boards are often recommended as the next step for users transitioning from to more professional 32-bit ARM Cortex-M microcontrollers. STM32 Nucleo boards - STMicroelectronics

: High-performance boards with extensive I/O access and specialized connectors like Ethernet. 2. Key Hardware Features