Twitter For Dummies?

I seriously don’t understand Twitter.  I have an account, I’m following crafty people that interest me (and following those that follow me), but I just don’t quite get it.  

I’ve read this guide and it’s still completely over my head.  I think I’ll need to do quite a bit more research so I’m not only tweeting my blog posts and Etsy listings because that would get boring pretty quick for my followers.  I'm sure people don't care when I'm eating a PB & J Sandwich and they want to hear about more than just my blog posts and Etsy listings, but I'm not quite sure what to write, what to share, and what to ReTweet.

I also don't understand hashtags and how it's different than just writing regular words.  Replying vs. ReTweeting is a mystery to me and I'm probably making myself look like a complete n00b.

Does anyone have any tips on how I can make sure I’m using Twitter effectively and not boring all of my followers?  

Follow me here, I’ll be sure to follow you back!