From Vim Tips Wiki
created 2006 · complexity basic · author orsenthil · version 5.7
:Explore opens the file explorer window.
Select a file or directory name and press Enter to open that file or directory.
To return to the explorer window, press Ctrl-^ (usually Ctrl-6).
You can also "edit" a directory to explore that directory. For example,
:e .. lists files in the parent directory.
 Other approaches
In normal mode, type
:e then press Space and Ctrl-D. That will list file names in the current directory. You can type a name and press Enter to edit that file.
If, for example, you want a name that starts with "get" type
:e get then press Tab repeatedly, or Ctrl-D to list all matches.
Another possibility is to use a mapping like this:
map <F2> :!ls<CR>:e
I wonder if there is a way to navigate the files with case being insensitive after you press Ctrl-D
I have a bug with navigation: sometimes FileExplorer switching onto another buffers. I'm opening 2 buffers: the right panel is empty, the left panel: FileExplorer. I'm on the left. Type ":e /home/user". Then press "-" (go to up directory). Oops! FileExplorer switching me onto the right panel! :-( What is it?