Does anybody know were I can see a video tutorial explaining how to use Playerprefs?
I don’t know that you need a video tutorial for that. There’s really not that much to the PlayerPrefs class; you can set values, query values, check if a key exists, erase keys, and maybe a couple of other things. Supported types are int, float, and string, IIRC (in 2.x at least - it might have changed in Unity 3). The docs cover everything pretty thoroughly, and also explain where the data is stored on the platforms that Unity targets.
If that doesn’t clear things up, your best bet might be to ask any specific questions you have here.
Well I really just need to know the basics for saving a game using playerprefs