Presumably you are using the site MODx installs by default, the one where the sidebar has this to say:
About Me:
Write about yourself here... To edit this text, login to the manager, and Edit the "AboutMe" chunk found under Resources > Manage Resources > Chunks (tab). Chunks make updating consistent "blocks" of content (like footers, menus or this text) used across multiple templates straightforward and efficient
If you now go to Manage Resources > Templates > Default Template and check out the code, you should find something like this:
<div id="sidebar">
<ul>
<li><h2>About Me:</h2>
{{AboutMe}}
</li>
<li id="dropmenu"><a name="dropmenu"></a><h2>Pages:</h2>
[!DropMenu!]
</li>
<li id="recentdocs"><a name="recentdocs"></a><h2>Most Recent:</h2>
[[ListIndexer?LIn_root=0]]
</li> ....................................
and this shows the chunks and snippets, and code for the headings, all contained in an UL, that will generate the content. Everything can be edited, styled with CSS, snippets configured, either in the template itself, in Manage Resources or on a page by page basis with template variables (TVs).
The only limit is your imagination.
Cheers
