A short guide to emacs.  For a longer guide, type 

emacs

(i.e., without a file name).

Also, ^x means:    control-x (hold the control while pressing x)
      Esc x means  press escape, depress, and then press x.

Open file:   emacs filename
Within emacs:

	^x ^c     :    exit
	^g        :    stop the command you're doing now.
	^g        :    in most systems, if youre not in a command ^g is a go-to

	^x s      :    save
	^x ^s     :    save
	^x ^w     :    save as
	^s	  :    search forward  (diff. from word's search)
	^r        :    search backward

	^k        :    erase till end of line
	^y        :    unerase 
	^y esc-y  :    unerase previously erased part (try it to see).

	^v	  :    proceed one-page forward
	Esc v     :    proceed one-page backward

	Esc <     :    goto begining of file
	Esc >     :    goto end of file

	^a        :    goto begining of line
	^e        :    goto end of line

	Esc %     :    replace iterms one-by-one (to not replace, press n)
	^d        :    erase next character
	Esc d     :    erase next word

	^x 2      :    split two windows
	^x o      :    goto next window	
	^x 0      :    close present window (if several are open)
	^x 1      :    make 1 window (i.e., close all other windows)

	^x ^e     :    goto command environment -- e.g., can write
                          f90 *f90
	^x ^f     :    open another file
	^x ^v     :    open another file in second environment

	and most importantly, for a file ending in .f90 :
	
	Tab	  : indents properly

There are many,many other emacs commands, but this list should do 99% of the
job.