By completing lessons 1 through 9 of the tutorial, you now have a basic understanding of Surfer and how to create and customize basic maps.
The remaining tutorial lessons are optional advanced lessons.
Lesson 10 - Customizing the User Interface shows you how to modify the quick access toolbar, ribbon, and keyboard shortcuts to improve your efficiency in Surfer.
Lesson 11 - Overlaying Map Layers shows you the three methods to overlay map layers.
Lesson 12 - Blank a Grid File shows you how to create a blanking file and use the Grids | Edit | Blank command to create a grid file with an irregular boundary.