Does [u]this[/u] help?
How much electronics do you know? Before you try to understand transistors, you need to at least know [u]Ohm's Law[/u] and [Kirchhoff's Laws](http://Kirchhoff's circuit laws).
If you were studying electronics in school, you'd have a semester of DC curcuits, and a semester AC circuits before you start learning about transistors, MOSFETs or other active devices.