Here is a region of Germany where I served. The first one shows the area without contour lines. The little symbols are for coniferous and deciduous trees.

And here I turned on brown contour lines.

I just use the smooth polygon tool to outline the contour and then fill it with green or brown shades with the contour line being the same color as the fill. To me, darker contour areas represent higher elevation. @Loopysue likes them the to represent lower elevations, but to me it looks like you are looking down a hole. This is a portion of the first map I ever made with CC3.

This is a desert region in California so the ground is brown while green indicates forest or orange groves in this case.

Quadrilateral! 😎

Well Done Jim!

I make contour maps for my wargames. It is a laborious process, but FT3, for a technically savvy person can use it to import real terrain files, then scale and cut and paste it into CC3. Not me. I can't even get it to import the terrain files - many of which are free. But there are people that can help you learn to do it. I find Brute Force and Ignorence [BFI (TM)] more useful to me.