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Or get one of the cheap Nucleo boards that has an onboard STLink v2. Jumpers permit that to be used with your own board. Can also snap it off from the main part of the Nucleo board.
Get a ST-Link or a Jlink clone, the UART will only allow programming, but you really want debugging, it's *very* useful.www.aliexpress.com/item/1005005142076263.htmlwww.aliexpress.com/item/32669702891.htmlOr as @wasedadoc said, a inexpensive nucleo board will pack both the stm32 and the stlink (Which you can isolate from the board and use with whatever stm32 you want).
For debugging I use a redirected print function, since I kept that (bad?) habit from Arduino. So I'm not 100% certain this means UART is enough.