You know the basics of moving around a file in Vim:
Here is a quick tip to jump around open windows in your Vim editor using those same keys: prepend the desired key with ctrl-w.
Jump to the window below the selected window:
Jump to the window above selected window:
Jump to the left:
Jump to the right:
The thing to remember is ctrl-w for window ... the rest is the same movement commands you already know :)