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If you want to learn about the mechanics of designing PCBs, install KiCad (https://www.kicad.org/) and go through these tutorials: https://docs.kicad.org/

Thanks! Yes I should probably start with something simpler, I have a tendency to want to skip ahead to the good stuff

KiCad is the good stuff. Having your design rendered in the 3D Viewer is a fun experience.