Guidance needed. Santa came early and he brought me a MacBook Pro (13") [View all]

I am lost! I've used my old Dell PC for years. Still have not mastered my iPhone and now I have this MacBook Pro and I'm scared to death.

If you use this machine, can you suggest a good on-line tutorial and a good book that I can use to navigate this machine?

My granddaughter(all of 20 years old) set it up for me on Wednesday. We had one hour together before she had to leave and I can't remember 95% of what she told me.

I tried to find a beginner tutorial that made sense to me but I guess I am better with a book in hand.
We had a bad storm yesterday and if the roads were good, I'd be on my way to Barnes & Noble for some book for 78 year old grandmothers who can hardly remember how to turn the machine on.
I need any suggestions you could give me for on-line help and the name of a good book with pictures(!) that I can follow.

My plan was to update my HP Laptop but I guess I have to meet this challenge. Have never used a Mac.
Help if you can.
Thanks,
PR