If you actually need a international-magnificence introductory direction, i can not propose professor scott wills at georgia tech surprisingly sufficient. He passed away closing 12 months of cancer, but his route lives on. The georgia tech ece2030 (advent to pc engineering) class has its text e-book and sporting activities all on line. To correctly understand why the computer can produce 2 1 = 3, you have to first decide what you're inclined to simply accept "on religion" and what you may not accept as true with till you internalize it. That piece of records might be at the level beneath the element you recognize. So if you need to recognize an adder circuit at the logical stage you may want to understand the fundamentals of "virtual" transistors (particularly cmos).