A quick look at a beginner 130 in 1 electronic project kit which i picked up on Ebay for just £8. You can still by these new although they are quite expensive. A great way to understand how eletronics works.
Also sold as Maxitronix electronic lab
The 130 in 1 Electronic Projects Lab Kit will start you on the road to a great hobby or career in electronics. It contains all the parts and instructions to assemble 130 educational and fun experiments and circuits. It is used by many educational establishments.