The strategy is to first get the element ID you want to append to, then create a new row element with the new data, and then append that element to the ID you got in step 1.
Perhaps something like this?
var newRow= document.createElement('tr');
newdiv.innerHTML = 'My Second Favorite Book';
You'll need to give the tbody
an id of 'tableBody'. You'll also then need to follow this strategy to add the td