Just as a bit of a visual backup to the points in this help topic, here's an Illustrator CS6 tutorial from InfiniteSkills that demonstrates basic distortion tools. Trainer Andy Anderson creates a few shapes and then demonstrates different types of transformations, including the warp tool, twirl tool, pucker tool (with tips on setting intensity), scallop tool and more:
It doesnt matter what i do. when i try to scale any object from larger to smaler, even when its on a group. it deforms the positon of the ancor points i think its a bug. because it doesnt matter what i do whit the configuration, its still bothering to the point that is really unconfortable to work.
Using CS6, I pasted an image to a new board, then attempted to skew. I could get the boundary to skew, but then when I released the mouse or the Ctrl key, it would snap back.
No idea what I did wrong.
You can't distort placed raster images.
If you want to distort raster images, select the image and choose Object > Envelope Distort > Make with Mesh. Enter 1 row and 1 column and click OK. You can then distort the image as you'd like.