Advice for a PhD... who is aiming for industry
In general, the optimal thing for a PhD student aiming for the private sector is to quit the PhD as soon as he or she can get a relevant job.  There are exceptions if the private sector job involves actual research, and some private sector jobs require the specialized knowledge of an MS or MA degree.

Beyond the basics and the necessary theoretical knowledge, the soft skills and the relevant technical skills are much more easily picked up while working in industry, since you get daily practice in the specifically relevant skills.  In addition, one generally gets paid much better in the private sector than as a PhD student.