In a very cold bowl that has been in the freezer for at least 1 hour, add your heavy cream, powdered sugar or cane sugar, cocoa powder, vanilla extract and pinch of salt
Using a stand mixer or hand mixer, beat until soft stiff peaks form. The mixture should be thick enough to hold itself on the beaters without falling. It should be soft and fluffy. Overmixing will make the mixture separate and turn into butter (not joking).
You can do this step by hand with a whisk but be forewarned...it is time consuming this way as it takes approx. 15 minutes of continuous mixing. I highly recommend letting a machine do the work for you in this instance.
Once the whipped cream is soft and fluffy, cover and refrigerate until ready to top the cake