This is a small list of YouTube videos for those interested in learning a little about the Arduino. Most of the introduction lessons are less than 5 or 10 minutes.
I picked these because they are for people who have little knowledge of electronics or Arduinos.
In fact you don't need to know anything about electronics or Arduinos. You'll learn as you go in simple steps. After a week or two, most of you will be able to build a simple particle accelerator from a kit.
If you find all this interesting, I'd suggest getting an Arduino starter kit such as one of these - Elegoo UNO Project Basic Starter Kit with Tutorial and UNO R3 for Arduino - $17 USD, or the Elegoo Mega 2560 R3 Project Starter Kit For Arduino Mega2560 - $28 USD.
You'll be able to use either of those for almost all of the Arduino lessons that you'll run into. Not to mention, that if you want to actually make some small control panels, you can use the parts in the kits to do that.
If you have some Arduino experience, then by all means choose the parts individually. For instance - anything that I build will probably be with a Teensy 3.2 Arduino. But I'll use my Arduino Mega to learn on.
Watch the first video from each of these to find the person who presents the lessons in a way that makes the most sense to you.
Think Making - Arduino Tutorials
[youtube]http://www.youtube.com/watch?v=DPiPvmxB8pc[/youtube]
Arduino Course for Absolute Beginners
[youtube]http://www.youtube.com/watch?v=09zfRaLEasY[/youtube]
Paul McWhorter - Arduino Lessons
[youtube]http://www.youtube.com/watch?v=d8_xXNcGYgo[/youtube]
Other lessons/tutorials that might be useful
Programming Electronics Academy - Arduino Episodes :: Season 1
Programming Electronics Academy - Arduino Crash Course with Lessons and Tutorials
Programming Electronics Academy - Section 0: Familiarization: Arduino Course for Absolute Beginners (Re-mastered)