Default color scheme might be difficult to read on black background.
To change it to a lighter scheme that is easier on the eyes you need to create a new vim profile in your profile directory. It's a hidden file called .vimrc
Run the following two commands from a shell:
echo colo desert >> ~/.vimrc echo syntax on >> ~/.vimrc
These two commands will create the file if it does not exist or if it does we add the color scheme configuration without overwriting existing settings.
Here's how the .vimrc file should look like (again, yours might contain more stuff):
Now the same file should be easier to read!