A single book? There's a long, long way between Ohm's Law and building an 8-bit processor. Maybe start with "Practical Electronics for Inventors" or "The Art

A single book? There's a long, long way between Ohm's Law and building an 8-bit processor. Maybe start with "Practical Electronics for Inventors" or "The Art of Electronics" to get the electronics background. Then go with "The Elements of Computing Systems" or "Digital Design and Computer Architecture" to get the digital logic and processor architecture background. If you just want to assemble an 8-bit computer from parts, then, as other posters have suggested, go with Ben Eater's tutorials and kits.