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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
user66517
If you don't know how to solder yet, get a pinned pico - that way you can connect it using breadboard and/or dupont line http://www.ebay.com/sch/i.html?_nkw=dupont+jumper and don't have to solder pins on just to get started. The downside is that it's more expensive, and you can't solder them down to something like Gordon's shield adapter, or my Project Board - but if you odn't know how to solder yet, that's not a problem for you.
I'm not sure I have a good resource in mind for general conceptual stuff, beyond what's in the site reference. It's easier to answer specific questions :-P