Looking for a longer modeling walkthrough? 3D Artist and trainer Michael Balchaitis has posted one that will take you through a number of modeling techniques and tips for working with more organic and irregular shapes. The tutorial covers making a stylized treehouse model in Cinema 4D.
If you are just getting started with modeling, a tutorial like this really emphasizes that there is no real magic trick to modeling anything. It’s all pretty straight forward, with a handful of modeling tools that can offer a wide range of abilities when modeling.
Michael also covers a bit about lighting the stylized treehouse and some basic rendering.