Moving, turning, and making things disappear is 90% of what you need know to write something! Ok maybe I'm exageratting, but take a look at the API's, find other useful methods like adding stuff to the world, setting the background, using the mouse, etc.

Click on the 'Documentation' link near the top of almost any Greenfoot page (including this one) and just to the right, in the area with the label 'Reference', you will find the Greenfoot API. I usually just access it 'online', but you can download it, if you prefer. Look over the methods of each of the six classes listed. There is much more than just moving, turning and making things disappear!

thank you guys so much! I have another question/problem. I've started a scenario just to test stuff and i have a background and an actor. There is a separate editor for each one. Is there any way to put all the source codes into one editor? Or will each thing have its own editor?

In Greenfoot, there is no way to put ALL of your code in one 'editor'. Well, you could probably come close to it, but it would almost assuredly have to be the world class and it would have quite a job trying to keep track of everything that would be happening within the scenario (and you would have quite a job trying to keep track of all the code within the class).

You say you have gone through the tutorials, but have you checked out any of the on-line videos? They might give you a better understanding of much about Greenfoot and coding in it.

AMEN to that!!!

so I've been going pretty good for a while. i now have an actor shooting something at another thing. how do i get the projectile to disappear? both on contact and if it hits the edge of the world. i used the code the tutorial provides to make the object disappear when my projectile hits it. i tried using this same thing to get the projectile to disappear when it hit the object but it isn't happening. i could really use some help.