To Turn Soil in the Fall or Not

by Rich G.
(Easton, PA)

I am a bit confused. In the article, "3 Mistakes to Avoid When You Prepare Garden for Winter," it is mentioned to avoid over-cultivating; however, in other articles, it is suggested to turn mulch. in the fall. I have a covering of grass that I use to prevent weeds and would like to know if it is Ok to turn that over in the fall so it decomposes in the winter. What is the recommended approach?
Many Thanks