Tutorial On Designing/Building A PCB (Using FOSS)
For those interested in pcb design and you're not tied to FOSS I'd definitely recommend trying upverter.com.  It's made loads of progress in the last few years and is probably the best / easiest to use layout software for beginners that I've come across.I've worked with eagle, altium, and briefly KiCad but I can never get over the tediousness of using KiCad. I recently checked out upverter and after watching their tutorial was able to design an LCD adapter board from start to finish in ~2 hours.Not trying to knock too hard on KiCad because it's great that we have an FOSS option, but if you're just into tinkering, upverter definitely has an easier learning curve and is pretty powerful.  I always find that I want to spend my tinkering time actually getting my project designed instead of fighting with tooling.