I want to learn about how to use ARDUINO. (no replies)

Hello.
I want to learn how to program Arduino microcontroller.
I know some C programing language, no Assembly. I never made projects that were complex enough for C++. I have a hard time using Assembly because it makes me think of reinventing the wheel sometimes. I write a code that is already a part of some C command.
I had to use Assembly but I followed directions in the book or copycatted someone else's code. It seems like there are many versions of Assembly for different compilers/manufacturers of microcontrollers.

I want to use Arduino for sensors, signal generation, some basic mathematical analysis of data, controlling stepper motors and for USB interface.
Can you recommend me a book to read or a class t go to, near Frederick MD?

I have a problem that I have to learn those things alone. None of my friends are interested in this stuff. Even those who work with IT.
In the past I messed with PIC microcontrollers but got nowhere because I used software that was not very well supported and for other reasons.

Help me please.