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It's worth checking out these videos: The Learning Circuit
Also, although you're interested in the moto mods, easier platforms to start experimenting with are the Raspberry Pi and Arduino, because there's lots of information for them. Once you're familiar writing code and connecting electronics, then you can feel more confident moving to other platforms perhaps.
Pi info here:
You can get to the Pi and Arduino content from the "Build" menu item on this community website.
For useful books, see here: