I like "This Old Tony's" CNC Basics and CNC Basics 2 and have been recommending both recently. Both are easy to digest and well presented (besides, the guy sounds like Alan Alda....once that's been put in your brain, all you can picture is Hawkeye in a floppy green hat talking to his hands) In the first, he goes through a pretty basic cut. In the second, a little more complicated one, and works through some problems along the way. Did I mention he sounds like Alan Alda?
The "Guerilla guide to CNC machining, mold making...." (@WillAdams listed) is excellent at getting you an overview of what you need, how the different parts of the workflow go together (don't get hung up on the mold making part), and what many terms mean.
I'll second NYC CNC, especially when you want to get into things a little more complicated, or want to learn how to use Fusion360 (which is awesome, and free for hobbyists) He's got much larger machines, so can do things we can't on our SO machines, but all the basics are basically the same.
As @PhilG says, there have been a LOT of things covered here. Please, ask questions, everyone here shares a common interest. The Wiki does have a lot of frequently asked questions. The hardest part (I think) is learning the lingo. Once you have some of that, it's a lot easier to find the answer to your question - You're way more likely to find an easy answer to "Z-axis doesn't move" than "The router thing doesn't go up and down."