1. Make tables:
To make a table, begin it by using the "<table>" tag. After this, you need to create a new row using "<tr>". After this, you make an entry for data using "<td>". After you have your data entered, put in "</td>" and either start a new data entry, or end the row and start a new one. After you have everything entered, finish the table with "</table>". For information about all of "<table>" etc's various options(Width, height, border), check the W3C website.
Example:
CODE
<table>
<tr><td>Row 1, Data 1</td>
<td>Row 2, Data 2</td></tr>
<tr><td>Row 2, Data 1</td>
<td>Row 2, Data 2</td>
</tr></table>
2 & 3. Comments and forms:
There are various ways to go about this, but I'll use PHP for my example. The simplest way(The simplest method is actually a shoutbox, which I'll demonstrate). You simply want to make a form which takes people's input, writes it to a file, and then outputs it to the shoutbox. You could also use MySQL(Which is a little more advanced than I'm willing to write a thread on to answer this question), and using multiple files for multiple comment boxes. Also, for a form, just try and read the code. It's fairly all-encompassing of your questions. Anyhow, on to the script:
CODE
<?php
if(!file_exists("./shoutbox.txt"))
touch("./shoutbox.txt");
if(isset($_POST["shoutcomment"]))
{
$name = $_POST["name"];
$comment = $_POST["com"];
if(!$fh = fopen("./shoutbox.txt", "a")) die("failure");
fwrite($fh, $name . "\n");
fwrite($fh, $comment . "\n");
fclose($fh);
}
if(!$fh = fopen("./shoutbox.txt", "r")) die("Failure");
?>
<table>
<?php
while(!feof($fh))
{
echo "<tr><td>" . fgets($fh) . "</td><td>" . fgets($fh) . "</td></tr>";
}
fclose($fh);
?>
</table>
<form action="?" method="POST">
<input type="text" name="name">
<input type="text" name="com">
<input type="hidden" name="shoutcomment" value="1">
<input type="submit" value="submit">
I don't even know if it works. But it's a very poorly written POC script. Also, if you want to test the script you'll need to make sure that your apache process(Or whatever httpd you use) is able to write to a file in the directory called "shoutbox.txt" or has write permissions in the directory.
4. Google