Sketchup Terrain

When i draw to make terrain to use the smoove tool it only works with 1 click at a single area then i try to click several times nothing works.Please can anyone guide me.

Have you tried using the ‘Eraser’ tool while holding down [Ctrl]?
Otherwise what does your model look like? Maybe share it here?

With each tool that you use, look at the status bar down left on your screen to see some alternative options that make the tool work slightly different ----> thus some tips!