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Where/How to learn about Engineering basics?

I have been recently looking into engineering and how to build different equipment, and am wondering where people learn to do these kinds of things.  The first thing I saw that had inspired me was a man who built a glove and software that replicated finger/hand movements in motion capture fashion that was useful to me because I do 3D animations which is helped by motion capture.  I had built it because he had left a step-by-step tutorial on how to do so, and it worked perfectly.  The thing that upset me was that I have no understanding of how these parts work, I just bought the equipment and put it together based on his instructions.  So I am wanting to ask how I learn about this stuff?  Things that I am wanting to learn I believe are geared around Micro controllers (EX: Arduino), MotionTracking Device's (EX: MPU-9150), Multiplexers, and other stuff that revolves around that.  I have been looking for tutorials and books to help but have had no luck.  Also one of the most frustrating things I faced when putting the gloves together was that I had no idea what 'SIG', 'VCC', 'GND', or any of those meant.  I understand that I might sound pretty stupid, but I am genuinely interested in this am looking to learn about it, I just do not know how to.  Thank you for any reply in advance.

The Instructables site is a great place to start– plenty of people on here are teaching themselves electrical engineering. I recommend looking at the earlier projects of https://www.instructables.com/member/amandaghassaei/. In particular, https://www.instructables.com/id/Breadboard-How-To/ is a good place to start.

A lot of the terminology ('VCC' etc.) can be alienating at first, but eventually not so bad. You can google/wikipedia unfamiliar terms to get their official meanings, but the best way to really understand them is to apply them– e.g. GND means 'ground', but it's hard to get an intuitive understanding of what that means until you've also made a circuit or two.

There's also a bit of overhead for getting into electrical engineering; you'll definitely need a breadboard, some wires, resistors, LEDs, and an Arduino (or Tessel once they come out) if you want to be able to program things.

If you really want to get into it, you'll need a multimeter at least and probably more (here's a really complete toolkit: http://blog.technical.io/post/67667723038/inside-erics-toolbox-an-electrical-engineering-kit).

Feel free to ask me for elaboration if you're still confused, & good luck!
There are many fields of engineering. Sounds like your looking at electrical engineering. Most people go to collage to learn the higher level stuff and get there basic knowledge from learning from friends or in high school classes.

You will want to start with basic electronics. Look it up and you'll find all sorts of helpful information. Then learn Ohms's Law. It's the cornerstone of understanding electronics. Once you have the basics down you can start building from there with various projects.