Here are a couple videos I posted late last summer building more terraces. I originally videoed these for the benefit of any interested customers on my social media.
I recognize not all people will need equipment this large to build raised plantings. I’ve also used skid loaders to build mounds, as well as built them by hand in my back yard. Additionally I’ve built mounds in my backyard by renting a small stand up loader (small machine) to build up dirt.