The SSCHA python code is largely based on the CellConstructor package. Getting familiar with it will help you extract the most of your SSCHA applications. It can also be used for many other purposes. You can download the full documentation of CellConstructor here.
The documentation of the python-sscha code can be found instead here. The full documentation will help you understand all the functionalities of the SSCHA code, beyond those illustrated in the Tutorials.