"Q3: Is it anything like history window in Photoshop or something like this? That I could delete two steps and more behind instead of restoring object all the time?" I don't think so. It would take up waaaaay too much memory to have a multiple undo feature. But, you can go back one time. Go to the "edit" menu, I believe it is and click "undo" and it will undo the very last thing you did with the exception of applying MAT files and textures. At least that is how it is for me. =) Oh, and there aren't any stupid questions, love. Everyone has started out in the same boat as you, even if they don't want to admit it. ;)