Okay, we have typed enough. At this stage, hopefully, your file is looking something like this:

      1 %        File: sample.tex
      2 %     Created: Sun Jun 22 04:00 PM 2003 P
      3 % Last Change: Mon Dec 15 07:00 PM 2003 
      4 %
      5 \documentclass[a4paper]{article}
      6 
      7 \usepackage[sumlimits,]{amsmath}
      8 
      9 \begin{document}
     10 \begin{equation}
     11 	\label{eqn:euler}
     12 	e^{j\pi} + 1 = 0
     13 \end{equation}
     14 This is the famous euler equation. I
     15 will type another equation, just as
     16 true:
     17 \begin{equation}
     18 	\label{eqn:simple}
     19 	1 + 1 = 2
     20 \end{equation}
     21 This is my contribution to mathematics.
     22 \end{document}

In normal mode, press \rf. This will fold up the entire file and you should see the file looking as below:

      1 %        File: sample.tex
      2 %     Created: Sun Jun 22 04:00 PM 2003 P
      3 % Last Change: Mon Dec 15 07:00 PM 2003 
      4 %
      5 +--  4 lines: Preamble:   \documentclass[a4paper]{article} -----
      9 \begin{document}
     10 +--  4 lines: equation (eqn:euler) \label{eqn:euler} -----------
     14 This is the famous euler equation. I
     15 will type another equation, just as
     16 true:
     10 +--  4 lines: equation (eqn:simple) \label{eqn:simple} ---------
     21 This is my contribution to mathematics.
     22 \end{document}

What has happened is that Latex-Suite folded away blocks of LaTeX code into folded regions. You can open and close folds by using the command za in normal mode.