A defining feature of the STM32F103 is its extensive set of integrated peripherals, which allow it to interact with the physical world without external components. Tuijin Jishu/Journal of Propulsion Technology STM32F103 - Arm Cortex-M3 Microcontrollers (MCU) 72 MHz
The coverage of the STM32F103 (the "Blue Pill" chip) is exhaustive. It covers: the stm32f103 arm microcontroller and embedded systems work