First, an intro: I have just joined the forum, after reading for a few weeks. I am a happy amateur, tho not a very knowledgable one. I have used 'consumer grade' film SLRs since 1978 (Minolta XG7 then Nikon FG). I understand the very basics (aperture affects depth of field, that sort of thing...). For ~3 years I have used a Nikon e5000 as my initial dive into digital, and taken a few thousand pictures of my kids and our travels. I have been ready to make the step to dSLR for a while.
A very good friend recently purchased a Nikon D70, likes it for his purposes, and is giving me his 3 year old D100 and the original 18-35mm lens. This will give me something very nice to play with, to learn more than the basics, and to see what's important to me before I buy something more current.
So my question: Is there a good tutorial (online, on CD, in a book) that can reinforce my basic understanding, take me deeper into the technical stuff, and help me learn what is possible to do with a digital SLR, all based on using the D100?
As a side note: I would really like to get back into macro photography, something I never learned how to do well with the Coolpix.
Thanks for your time, and wish me luck!