Step by step tutorial.

Hello

I am new to OPENCASCADE and i want to understand the STEP file format i.e produce the shapes in it and do various type of modifications in a STEP file, basically i must be able to extract all the information given in a STEP file.

So is there any proper tutorial(not one in documentation) where i can learn it or is there any other way to do this. Providing with a sample code of C++ will also be of great help as i have recently learned C++.

Thanks in advance for help!!!