When blogging, I can put a block of text in a grey box like so:
<p class=greybox>My text</p>
But how can I put a box within a box? Also how can I put multiple paragraphs in a box? Is grey the only color available for the boxes? And finally can someone post a link pointing to where I can learn more about mark up tags for WordPress?
Thank you.
What you are showing is HTML markup, not unique to WP. Here is an extensive tutorial on HTML.
The usual way to create a 'box' is to use a div:
<div class='my_outer_box'>
<div class='my_inner_box>
<p>An inner paragraph</p>
<p>Another inner one</p>
</div><!-- End of my_inner_box -->
</div><!-- End of my_outer_box -->
The divs would then be styled with css:
.my_outer_box {
border: 2px solid green;
}
.my_inner_box {
padding: 5px;
border: 1px solid red;
}