Sections are great. They're a way to partition off part of the content of a text document and treat it differently.
Quick Overview of Sections
Select your text that you want treated differently, choose Insert > Section, and choose any of the options in this window and the tabs such as Columns, Background, etc.
When you insert a section, it just means the content you selected is now partitioned off and assigned the attributes you specified in the Insert Section window.
This section below is in two columns with a gray background, because I used the Columns and Background tabs to apply those settings.
For this next sample section, I didn't select any text -- I just choose Insert > Section, chose Link, and specified the legal.odt file. Here are those settings in the section window.
And here are the results. The contents of the legal.odt file got sucked into my current document where I inserted the link. Now anytime somebody changes the contents of the legal.odt file, those changes show up in the my document, too, since I've linked to that file.
To edit the section, choose Format > Section and select the section to change options for or delete.
I could write a whole bunch about sections. However, the main point of this blog is to point out a few things about knowing which section you're in.
Name your sections. When you have more than one section in a document, things can get confusing if you don't name them.
So when you choose Insert > Section to create the section, type something more clearly memorable for the name.
Or if you've already got sections, choose Format > Section and rename them.
Also if you click in a section and choose Format > Section, the section name will be highlighted.