Bootstrap has a really good online help site here.
Example Two: If you embed tables, then you'll want to wrap your table in a 'responsive class' (or rebuild it using the Bootstrap grid, but that's a little more complicated).
In a non-responsive storefront, your HTML for a table would look like this:
<table>
<tr>
<td>
</td>
</tr>
</table>
Whereas in a responsive store, you will want to use:
<table class="table">
eRatex helps out by embedding the Bootstrap engine into your store, giving you complete freedom to learn about new techniques and implement them .