Hi
Generally people pick their own things that interest them or that they really want to see done.
If you are using LibreOffice 3.5.x then Impress might be a good guide to work on. You could try proof-reading Chapter 7 or do the first draft of Chapter 9. Someone has just laid claim to Chapter 8. You can get a fairly good idea of what needs doing from this page
https://wiki.documentfoundation.org/Documentation/Publications
Base is a bit of a nightmare to write for as there is no first guide to work from. There are a few people working on it.
I think most people are unhappy with the 3.5.x branch and seem to be racing through the last few guides for 3.4.x. Draw would be a great guide to work on but i think someone has already made a start.
Good luck, welcome in and regards from
Tom
<quote author="PeeWee">
Hello
Chap 07 Including Spreadsheets, Charts and Other Objects has been uploaded to ODF Authors in Draft LO3.5 ready for review.
Now for Chap 08.
Regards
Peter
</quote>