Hi Shiblie,
You will probably find out just about everything you need to know here.
http://peltiertech.com/
For questions on charting it is probably better to ask in the charting
newsgroup. Jon Peltier (and others) are regular and prolific
contributors to that group.
HTH
Martin
>I have lots of graphs to do and I don't have a good knowledge about them,
> is there any website for teaching how to make graphs?? (on excel)
>
> thanks,
> shiblie.b