How To Decorate Cakes

First, I Will Clearly State That I In No Way Have A Lot Of Money To Spend On Anything (my Grandmother Took Several Weeks Taking Cake Decorating Classes And Spent Hundreds Of Dollars On The Supplies And Classes - She Makes Beautiful Cakes, Though).

I'm Looking For A Inexpensive Style To Decorate Cakes To Make Them Look Great And Not Cheap.

Personal Tips Would Be Appreciated; Websites Would Be Even Better.