Online Electronics Tutorials and Books

General electronics theory

Electronics Club Great set of tutorials for beginners. You can find basics about electronics components, logic circuits, projects and so on...

Soldering and practical skills

Making good quality homebrew PCBs

PCB layout and CAD

Dave's PCB layout tutorial

Microcontrollers

Hitex insider guidesGuides for several ARM based MCUs

FPGAs and hardware description languages

VHDL Tutorial