i didn't really use Illustrator before, but i'm having troubles with some basic things such as aligning shapes together accurately. I'm using this auto-snap feature to align things but it's never really pixel-accurate as shown in the screenshots:
Whenever i try to resize the shape so that it fits the edges of the circle it snaps back as shown in the screenshot. Don't get me wrong, i just want to have the shape the same size as the outter circle.