After installing Spacemacs, you'll see two windows:
The top has menu options and shows what packages were installed. The bottom has detailed package install information.
The first thing I do is hit the spacebar, which brings up a menu:
The menu shows you what shortcuts are available. Let's choose w (window):
Now choose j to move to the bottom window:
Now, let's close the window with SPACE w c.
Next: How do I open a file in Spacemacs?