Wheel height and width, 17x7 17x7.5 17x8 etc. the 17 is a 17 inch wheel. The 7, 8 etc is the width.
Offset, +38 +52 etc. Has to do with the hub backspacing. So how fat the hub is in relation to where the wheel spokes and such are. This part is the confusing one.
Tires, 225/40/18. 225 being tire width. 40 being tire height. 18 being wheel size.