Saving And Loading on Android

I have a neat android game I created for my sister, 50 levels, power-ups, puzzles, and so on. My problem is the saving part, I have read saving tutorials, and stuff like that including the "PlayerPrefs". I didn't understand any of it! I tried copying and pasting how I understood, and I got so many errors! Not to mention that I learned nothing from all those hours of searching!!!

What I'm asking isn't exactly for others to give me full scripts with everything (though that would be very helpfull), I would like something that I, and all the people who are new to scripting could (easily) read And Understand!

The main thing is I would like to be able to do is save data (lives, points, current level, and so on) then be able to read that data. If it matters, I'm using Unity 3D 3.5.0, and testing on Nexus 7 tablet.

Thank You to everyone (including those who just read the question) for taking time

oh, and sorry for any weirdness, Unity Answers didn't allow me to log on...