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by anujdeshpande 1061 days ago
I’d recommend you watch video tutorials on KiCad to get started with making a board.

I’d recommend starting a little simpler - by making a custom board on a breadboard using pin breakout PCBs - https://www.adafruit.com/product/1377

That will give you an idea about the bare minimum circuit one needs to build a functioning board (crystal, power regulator, boot select buttons, and so on)