Gimp Shortcut Question?

So i'm using gimp for the first time in my life 'cause i can't use PS at this moment and am finishing the transition very irritating xD

One of the things which is causing this irriations being that i can't seem to find a way to resize images the way i would in PS.

So i ask you how does one resize an image by grabbing the control of an image and getting it to scale down perfectly?

(in PS you'd just grab a corner and hold SHIFT as you did so, which would result in a perfectly scaled down image with no deformities)