Start with a Folder named "_Guide" Put your Guide file in there.
If you browse those folders with your web browser, FF or IE, save the Guide File, in the same top folder as all your Web folders, as a *.htm and name it "index.htm"
I have a ton of such "Web Page Help files". the top Folder on each subject is named according to the subject. It contain all the subfolders and one *.htm* file, "index.htm"
I use a Command Prompt in each Top Folder with the command Dir >> DIR.txt to create a simple text file with all the folder/file names. I then edit that text file to read like
<A href="Folder1Name\"> Folder1Name</A><br>
<A href="Folder2Name\"> Folder2Name</A><br>
<A href="Folder3Name\"> Folder3Name</A><br>
Then save it as "Index.htm". At this stage, you can name the index folder as you please, For instance "Gardening.htm"
<br> is an HTML CarriageReturn/LineFeed
In each of those folders, I again create a Dir.txt file.
This time I first arrange all the file names in the order I want, (delete all the "FileName_Files" Folder lines.) The I edit the rest of the lines to look like
<A href="FileName.htm*">FileName</A><br>And again save this text file as "index.htm"
This works because when a Web browser is sent to a folder, it looks for a file named "index.htm*"
Here is an excerpt from one of my actual upper level indexes
<HTML><BODY>
<table>
<tr><th>The Authors Books</th></tr>
<tr><td><a href="Andre%20Norton/">Andre Norton</a><br padding=0><hr></td></tr>
<tr><td><a href="Catherine%20Asaro/">Catherine Asaro</a><br padding=0><hr></td></tr>
<tr><td><a href="Christopher%20Anvil/">Christopher Anvil</a><br padding=0><hr></td></tr>
<tr><td><a href="David%20Drake/">David Drake</a><br padding=0><hr></td></tr>
<tr><td><a href="David%20Freer/">David Freer</a><br padding=0><hr></td></tr>
<tr><td><a href="David%20Weber/">David Weber</a><br padding=0><hr></td></tr>
<tr><td><a href="Elizabeth%20Moon/">Elizabeth Moon</a><br padding=0><hr></td></tr>
<tr><td><a href="Eric%20Flint/">Eric Flint</a><br padding=0><hr></td></tr>
<tr><td><a href="Harry%20Turtledove/">Harry Turtledove</a><br padding=0><hr></td></tr>
<tr><td><a href="Holly%20Lisle/">Holly Lisle</a><br padding=0><hr></td></tr>
<tr><td><a href="James%20P.%20Hogan/">James P. Hogan</a><br padding=0><hr></td></tr>
<tr><td><a href="James%20Schmitz/">James Schmitz</a><br padding=0><hr></td></tr>
<tr><td><a href="Jeffry%20Carver/">Jeffry Carver</a><br padding=0><hr></td></tr>
<tr><td><a href="Jerry%20Pournelle/">Jerry Pournelle</a><br padding=0><hr></td></tr>
<tr><td><a href="John%20Dalmas/">John Dalmas</a><br padding=0><hr></td></tr>
<tr><td><a href="John%20Ringo/index.htm">John Ringo</a><br padding=0><hr></td></tr>
<tr><td><a href="K.%20D.%20Wentworth/">K. D. Wentworth</a><br padding=0><hr></td></tr>
<tr><td><a href="Keith%20Laumer/">Keith Laumer</a><br padding=0><hr></td></tr>
<tr><td><a href="Lois%20McMaster%20Bujold/">Lois McMaster Bujold</a><br padding=0><hr></td></tr>
<tr><td><a href="Manly%20Wade%20Wellman/">Manly Wade Wellman</a><br padding=0><hr></td></tr>
<tr><td><a href="Mercedes%20Lackey/">Mercedes Lackey</a><br padding=0><hr></td></tr>
<tr><td><a href="Murray%20Lienster/">Murray Lienster</a><br padding=0><hr></td></tr>
<tr><td><a href="S.%20M.%20Sterling/">S. M. Sterling</a><br padding=0><hr></td></tr>
<tr><td><a href="Sarah%20Hoyt/">Sarah Hoyt</a><br padding=0><hr></td></tr>
<tr><td><a href="Spider%20Robinson/">Spider Robinson</a><br padding=0><hr></td></tr>
<tr><td><a href="Travis%20Taylor/">Travis Taylor</a><br padding=0><hr></td></tr>
<tr><td><a href="Wen%20Spencer/">Wen Spencer</a><br padding=0><hr></td></tr>
</table>
</BODY></HTML>
As you can see, I formatted it into a table. <tr> starts a table Row, and <td> starts a table text cell. the "%20" is used to replace spaces in the link address to prevent some browsers from raising an error.
As you can tell from all the other links, the "index.htm" in this line is redundant.
<a href="John%20Ringo/index.htm">John Ringo</a>
Each folder linked to above also has an "index.hm" file in it.
The
<br padding=0><hr> is just to pretty up the display