How do I draw a grid in sketchup free?

I want to draw a terrain and for that I need a grid. However it seems that sketchup free does not have a sandbox feature and all the tutorials out there for drawing a grid requires sandbox.

You can draw a grid by drawing a line and then copying it with the Move tool to create an array. Or you could start with a square so you also get a face. Make a linear array with Move copy in one direction and then select the row of square and create a linear array in the other direction.

Alright, I got it. Thanks!