IMPORTANT INFORMATION:
You should remember that the vast majority of people earn nothing as a result of taking training courses.
This is true in all sorts of fields – for example, only a fraction of people get healthier after buying a diet plan book.
It is therefore safe to assume “average earnings” are zero. This could be for a variety of reasons including, but certainly not limited to, a failure to implement and follow through with the consistent work that is required.
Even when consistent work is applied any business is inherently risky. Projects often fail and result in no earnings or even losses.
Since this is the nature of business, if you feel uncomfortable with this risk, then please don’t consume any of our free or paid resources about becoming a professional writer.