[My characteristics]

Compatible with NUCLEO-F411RE based on Cortex-M4 STM32F411RET6
Compatible with Arduino, supports various compatible Arduino expansion boards, and is compatible with Arduino's huge ecosystem to gain more potential resources
Provides ST Morpho extension headers to make up for fewer deficiencies in compatible Arduino I/O interfaces, making it easy to connect peripherals freely
Support mbed, support mbed SDK and online tools to quickly build prototypes and shorten development cycles
With mbed online resources, you can refer to the constantly updated, rich STM32 integrated library software HAL and a variety of packaged routines