I have never been there (if I ever asked myself if such forum exists I would say - probably yes, but I have never asked myself that question). About Arduino I only know that it is probably a PCB form controller based on some microcontroller - may be Atmel’s, but I’m not sure of it.
I would expect there discussions about programming and why you connect bulb directly to voltage source and LED not, what for you use diode when driving relay and some may be about digital communication and supplying electronic.
For the questions about PCB finalizing (text size is in my opinion from that category) the better place in my opinion are the ECAD forums and KiCad forum is just one of them.
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