I wonder how many folks out there know you can take just about any course at MIT for free.
They just post everything online after the in-person course is complete. Lectures, supplements, tests, everything.
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@OldUncleMike
I've taken their courses on solid state electronics.
@ScottSoCal
Intro to solid state chemistry changed my life.
I've worked in electronics for decades and only last year learned to understand the bits of fab that come before we got our hands on the silicon.