The next part of philosophy that Scientology covers is the subject of Ethics. Most modern dictionaries mis-define it as a code of morality or the study of moral standards and how they affect conduct. To see how complex the area has become and the large number of competing theories check out this article about Ethics on Wikipedia. The intro seems simple but then we get into "Major doctrines of ethics" and at that point you can wave goodbye to common sense.
The big difference in Scientology Ethics is that it is aimed at use in everyday life. It gives simple, common sense and very workable methods to make the correct decision and proven formulas for changing conditions in life for the better.
The entire subject is very well covered in the book Introduction to Scientology Ethics. I use this book all the time and highly recommend it.