I started with having watched ~100 hours of EEVBlog :)

Electronics, PCBs, CAD, injection molding was all new to me.

I'm in the middle of my first hardware project right now and I can recommend the videos on the "Phil's Lab" channel on YT. He mostly uses Altium, but he has a few videos on KiCAD which really helped me. He also has generally good throwaway comments in his videos with regards to PCB design / component placement, as well as the order of operations for good PCB design.

	▲	nubinetwork a day ago \| parent [-]
		The only problem I have with these tutorials is that they're already outdated... I don't think anyone covers kicad 10 yet, and its quite a bit different than 9. (Individual dialogs might not have changed, but where they're located etc might have)