The last time I tried programming a Black Pill board with the Arduino IDE, it didn't work. The thinking was that the clock speed was off. Long story short, I never did anything with it because I was unable to find instructions clear about how to find and change the clock speed setting, and I had other boards to evaluate.
I would like to try again to get my black pill board working via the Arduino IDE. Is there a good page out there that I can follow to get it up and running?
I'd suggest starting here. It is actually for the blue pill, but is similar:
You'll also see there a bit about the history of Arduino / STM32.
There is also a dedicated web site: https://www.stm32duino.com/
For blue pills, I use the new "official" STM32 Arduino core and ST-Link clone programming device and the Cube programing utility.
Having said all that, I have only one current STM32 project.
Thanks! Hopefully, I'll be able to get it working this time 
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