[wonko1]

This is a really nice tutorial, not just on keyboard PCB design but Kicad in general.

I also recommend the excellent "getting to blinky" videos:

https://contextualelectronics.com/learning/getting-to-blinky...

Which teach the basics of Kicad too.

[pawadu]

Here are two more great ones that go from zero all the way to manufacturing:

https://www.youtube.com/playlist?list=PLjETOA1pRgmQnav7lGc9g...

https://www.youtube.com/playlist?list=PL4BSO74u0VpY7FKJK5ul7...