This is my first tutorial for GIMP.
I used GIMP 2.6.
If you are new to the GIMP and the tool is confusing you, then you should see some basic-tutorials first. Like those:
For Layers and Tools: [link]
Some Methods: [link]
In this tutorial i show the basics of cutting, pasting and some color-values. How to make crack-Effex... how to insert small people... damaged buildings ... smoke and explosion Effex will follow soon
Secon tutorial here:
Please tell me if this is helpfull to you