This overview is for people not familiar with Blender at all or if you want to dig a bit more and do something new with less common primitives.
A very rich choice of meshes and curves and ready-made objects to start your modeling, some of them are ready from the first time you start Blender, some others need to be enabled in the preferences window, all free, all included with Blender 2.8
“I tried to show some of the most useful and flexible shapes, curves, and meshes you can create with few clicks!
Special mention to the Rock Generator… it really rocks! Literally, a super addition to the environmental creation tools!”