We learned how to do the basic forms, using boxes and other geometry shapes. There is also another way to form an object , which is by using splines ( located at create). 

After drawing a rectangular box, you can extrude them, forming a 3D object.

When you press f3, your screen will appear like this, its like an x-ray vision where you can see through your objects. Isn't it cool? 

When you get familiar with the tools, you can create anything you can imagine. This is my first try out for a roller chair. hahaha 

This is a house in progress, just a mini exercise that my lecturer gave us and i thought this was hard. boy was I wrong. =.= It gets even better. stay tuned!