This is the code for creating a table
<td>row 1, cell 1</td>
<td>row 1, cell 2</td>
<td>row 2, cell 1</td>
<td>row 2, cell 2</td>
To add a picture or any media into a column you must select the one you want, and go to the library and add a picture. The trick is to get all the pictures in the same size, so you have to scale and crop the pictures (note to self: landscape is better)
To add a video from youtube you have to take the embed code from a slecetd video and insert it into the html, but adjust the height and width to what you want to match the picture sizes. Basiclly the idea is to replace one of the pictures, sp to get the size right is important, also, whatever you take off the height you must take off the width of the video otherwise the video will be distorted.