Do not listen to this. If you are going to rent it out you need to meet certain requirements, if not a good contractor will know how to frame it.
I highly doubt you want to take a course on it.
A good contractor is always an essential part of any renovation. For major renovations, they will not start any work until there is a proper architectural design in place.
You will be surprised how a Good Carpentry course helps you to pick out any flaws during the renovation. Obviously, it also helps even more if you have attended separate Plumbing and / or Electrical Courses. They will benefit your ability to add any minor projects after the major renovations have been executed. But again, good contractors will also insist that all the renovations meet the building codes and are approved, especially if you are renting out the properties. Insurance Companies do insist that all such criteria are met.

