I have learned how to decorate cakes by watching video, such as youtube. Wilton cake book are very good at telling great tips and techinques on how to decorate with buttercream and fondant icing as well. Just keep practicing and you will be amaze on what you can do. I usually practice on a dummy cake or wax paper(when it comes to piping). Micheal’s has a amazing cake decorating class as well. Good luck, and remember to have fun with it.