The path from mechanical to digital needs a foundation in computers.
Computers are somewhat mechanical to a point. Hard disks must plug into motherboards, and motherboards need clean power. Filters need cleaning, cable contacts need wiping.
Then, there is software, and firmware and the operating system, busses and registers. Here are a few courses that will get anyone on the way to knowing. Any courses mentioned in the comments will be added to the list.
UNIX / Linux Tutorial for Beginners - From the University of Surrey–Guildford
UNIXhelp for users - developed at the University of Edinburgh















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