Arduino for STM32

Hi my custom card is made, I manage to program it with STLink V2 but using the generic F303K8tx card and it works correctly. I bought the STM32F303k8t6 chip on Mouser, so it's official. So I thought I could use my board as Nucleo32 F303K8. It doesn't work when uploading. Is there a solution for usin...

Hello
Today I use a Nucleo-F303K8 in a project, it works well but I would like to improve it
I would like to make a standalone board based on STM32F303K8T6.
My question is where and how to install a bootloader (similar to that of the Nucleo) in this chip?

HI, I would like to use the serial link via the card's usb connector to communicate with a pc via a graphical interface created with visual studio. If I understood correctly, this is possible because the card has ST Link and therefore a COM port is created on windows. Am I good? I will also use the ...

I use arduino ide for my various projects, on teensy or Adafruit Feather M4.
I wanted to try STM32s and had bought a NUCLEO32 L432KC, so here I am.
Thanks for your help.