@luto also really valuable, a small cheatsheet with some important shortcuts: https://silica.io/wp-content/uploads/2019/02/kicad-cheatsheet-landscape.pdf
@luto I've seen quite a few videos on PCB design and all of them are crap. There is way too much to cover and those who know anything know they know nothing and don't dare to make a lecture out of it.
On top of that, electronics design is a craft. Something that you need to learn by doing. It cannot properly taught by lecture.
My advice is, get someone who reviews your design and tells you how to improve rather than going to look for lectures.
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