The <table> tag starts us off, and this has a bunch of attributes you can apply to it, such as:
align (center, left, right)
background (for a file)
bgcolor (for a flat background color)
cellpadding (this is to leave room between the edges of the cell and it's contents)
cellspacing (this one is to leave room between separate cells)
Once you have your table, you'll want to put rows and columns in, presumably. To put in a new row, use the <tr> tag, while adding columns to the row is accomplished using the <td> tag.
To have a td cell span multiple columns or rows, use the attribute colspan="#" or rowspan="#"
Play around with some stuff and get comfortable, below is an example.
<table cellspacing="1" cellpadding="1" border="1" bordercolor="red">
<td> This is the contents of the first cell! </td>
<td colspan="2"> ...and this is the second, spanning 2 columns. </td>
<td rowspan="2"> Getting messy with 2 rows </td>
<td> Stuff! </td>
<td> More stuff! </td>
<td> Last cell! </td>
turns out like this:
|This is the contents of the first cell!||...and this is the second, spanning 2 columns.||Getting messy with 2 rows|
|Stuff!||More stuff!||Last cell!|