I too was confused when i was beginner in html. the <tr> is for the row, so when you say another <tr> it says another row. Now <td> is column, which must be inside the <tr>. So when you say next <td> that means next column. here is an example code:
Code:
<table border="1">
<tr> // this is your first row
<td>row 1, cell 1</td> // first column
<td>row 1, cell 2</td> //this is second column
</tr>
<tr> //this is your next row
<td>row 2, cell 1</td> // first column
<td>row 2, cell 2</td> //second column
</tr>
</table>
i have added some comments (in red) and you could remove them later if you copy the code above
ok? 
and oh for the images make sure they are of the same sizes otherwise you can specify the width of each images. example <img width="300">
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