The STM32F103C8T6 (also known as  ‘Blue Pill”) is a  development board based on the ARM Cortex M3 microprocessor.
 
NOTE : THIS IS NOT  "WE ACT BOARD " . THIS IS BLUEPILL STM32F103C8 with C connector and Microswitches for BOOT 0 & NRST
 
Naming Convention of STM microcontrollers
Parameter    Meaning
STM               name of the manufacturer (STMicroelectronics)
32                   32 bit ARM architecture
F                      Foundation
1                       Core (ARM Cortex M3)
03                     Line (describes peripherals and speed)
C                     48 pins
8                     64 KB flash memory
T                     LQFP package (Low Profile Quad Flat Pack)
6                     Operating Temperature Range (-40 °C to 85 °C)
 
Programming STM32
1) Using PA9,PA10 RX TX pins (Arduino IDE)
You can program your STM32 development board using Arduino IDE, too. You will require FTDI (USB to UART converter) for this process.  
2) Using Keil UVision and STM32CubeMX
This is one step further than the last mentioned process and is more professional in terms of usage. You will require the softwares ARM’s Keil Uvision and STM32CubeMX for this method of programming BluePill. You will also need the STLink/V2 which is a debugger cum programmer hardware provided by STMicroelectronics. These softwares provide a more sophisticated and professional programming environment for programming embedded systems