VIM: Close file without quiting VIM application?

I am new to VIM. I use e and w commands to edit and to write a file. It is very convenient. I am not sure if there is "close" command to close the current file without leaving VIM?

I know that q command can be used to close a file. But if it is the last file, the VIM is closed as well(actually on Mac the MacVIM does quit. Only the VIM window is closed and I could use Control-N to open a blank VIM again). I would like the VIM to stay with a blank screen.

From stackoverflow

• If you've saved the last file already, then :enew is your friend (:enew! if you don't want to save the last file). Note that the original file will still be in your buffer list (the one accessible via :ls).

• This deletes the buffer (which translates to close the file)

  :bd
  

  Rytmis : Yours is better than mine for what the OP asked, although I tend to prefer :enew because I like having the buffer in the buffer list. :)

  ephemient : +1, you beat me to it!

  Martin Andersson : When I do this, vim shows the first buffer, but I can still access the buffer

• :[N]bd[elete][!]                        *:bd* *:bdel* *:bdelete* *E516*
  :bd[elete][!] [N]
                  Unload buffer [N] (default: current buffer) and delete it from
                  the buffer list.  If the buffer was changed, this fails,
                  unless when [!] is specified, in which case changes are lost.
                  The file remains unaffected.  Any windows for this buffer are
                  closed.  If buffer [N] is the current buffer, another buffer
                  will be displayed instead.  This is the most recent entry in
                  the jump list that points into a loaded buffer.
                  Actually, the buffer isn't completely deleted, it is removed
                  from the buffer list |unlisted-buffer| and option values,
                  variables and mappings/abbreviations for the buffer are
                  cleared.

• If you have multiple split windows in your vim window then :bd closes the split window of the current file... so I like to use something a little more advanced:

  map fc <Esc>:call CleanClose(1)
  
  map fq <Esc>:call CleanClose(0)
  
  
  function! CleanClose(tosave)
  if (a:tosave == 1)
      w!
  endif
  let todelbufNr = bufnr("%")
  let newbufNr = bufnr("#")
  if ((newbufNr != -1) && (newbufNr != todelbufNr) && buflisted(newbufNr))
      exe "b".newbufNr
  else
      bnext
  endif
  
  if (bufnr("%") == todelbufNr)
      new
  endif
  exe "bd".todelbufNr
  endfunction
  

  dolzenko : Now what this snippet does?

• :bd can be mapped. I map it to F4, shift-F4 if I need to force-close because of some change I no longer want.