Please help me learn!

I'm posting this on Personal Computers and Technology too. So, background time! My brother knows a lot about computers, so I've never had to do anything with them, and now that I'm in high school and my brother's in college I figure I should start learning how to do zaidi with a computer then use web browsers and openoffice. Thing is, I know absolutely nothing. I am the Queen of the noobs and I'm trying to escape the noob kingdom. I'd like to learn about terms used, how to take care of a computer, etc. Is there a YouTube channel au a book I could use to start learning about them?