The getting started 6.0 book should consider the following addition,
besides a review of its current contents.
Topics from 5.3 release
* Update of the (new) dialog box for Area in objects (Several chapters)
* The new Safe mode (Ch 1 Introduction)
* Table styles and Table Autoformatting in Writer (Ch 3 Styles and
templates and Ch 4 Writer)
* The MUFFIN - Notebook bar (Ch 1 Introduction)
* Extension manager revamp (Ch 1 INtroduction)
* The page panel in sidebar (Ch 4 - Writer)
* Customization of context menus (Chap 14 - Customizing LibreOffice)
Source:
https://wiki.documentfoundation.org/ReleaseNotes/5.3
Topics from 5.3 release
* AutoText import from .dotx and .dotm files blog entry (Szymon Kłos -
Collabora) (writer)
* New formatting toolbar focused on the use of styles (writer)
* Custom Watermark inserting (Writer)
* Four new sheet protection options have been added to optionally allow
insertions and deletions of rows and columns (Calc)
* New feature - Pivot Charts (Charts/Calc)
* The Web wizard (which exports a set of documents as html with an index
and some styles from the last century) has been removed. Note that this
doesn't affect the HTML export. tdf#99967 (Samuel Mehrbrodt, CIB)