All good info. I have used dielectric grease (specifically DOW 4) for at least 30 years now on battery terminals PRIOR to installing the clamp or cables. Then I coat the whole connection with it. A spray such as Amsoil metal protectant sprayed on after the joint is assembled will also serve to prevent corrosion.You can prep the area to bare metal, install the lug and paint over the joint. Corrosion needs oxygen to form. A paint barrier can help.
I don't recommend star washers on electrical connections. You want as much surface area in contact as possible.
A more simple solution is bare metal and assemble the joints with dielectric grease.