Learning digital photography?

Learning the nikon d90

Read the manual for starters then if you need to buy a book http://www.amazon.com/...zon.com/s/" class='ext_link'>http://www.amazon.com/...zon.com/s/

If you want to learn the basics of photography in general then http://www.amazon.com/s/

The Nikon D90 is an excellent camera

Learning to use it or any other dSLR is a different matter. It is a fully adjustable camera, so you will need some time to learn how to use it

Just learn to use the cameras light meter

Http://kenrockwell.com/nikon/d90.htm

That should help you in familiarizing yourself with the camera.
If you are asking how to master photography, that's a whole new story. NOT one we can even begin to teach you here. There are reasons why there are tons of classes out there… It's a little complicated. You can absolutely do it-and without ever taking a class if you want to and work at it!
I'd suggest maybe Scott Kelby's 4 book set: Digital Photography
The Moment it Clicks by Joe McNally
Understanding Exposure by Bryan Peterson

Check out this site: http://www.digital-photography-school.com/digital-photography-tips-for-beginners
They also have a forum to help you learn.

The quickest, cheapest way to learn photography is to join a local Photography Club, you just can't beat going on a photo-shoot with an experienced photographer by your side.

Handling your camera quickly comes with practice, knowing what to adjust and why takes a little longer, just getting to know what they are thinking, what they are paying attention to as they take their images is worth all the book learning there's.

I always tell my students it takes 10, 000 shots to get the idea, in the time it takes to get your 10, 000 shots you get the 'overview' of photography, you learn to adjust the camera quickly and what to adjust it to for the shot you have in mind. That last bit is the important bit, 'what you have in mind'.
Having something 'in mind' is the key to good imaging, that, and where the light is coming from.