Don't show red curly underlines
With spell checking turned on, Libre Office will mark misspelled words with a red curly underline.
This can be toggled with Tools -> Automated Spell Checking, or possibly more easily with Shift+F7.
Macros
Add trusted location
It seems that a document needs to be in a trusted location to run a macro.
If a document with macros is not at a trusted location, an error message is shown when the document is opened.
Tools -> Options -> Libre Office -> Security -> Macro Security -> Trusted Sources (tab).
Requires restart, apparently.
Recording macros
Macros can be recorded if this feature is enabled using the menu Tools -> Options -> Advanced.
History bits
1985: StarWriter by Star Division.
Between 1985 and 1999, StarWriter is renamed to StarOffice.
1999: Sun Microsystems acquires Star Division and StarOffice with it.
2000: Sun Microsystems releases source code of StarOffice as
Open-Source and names it OpenOffice.org
2010 (2011?):
Oracle acquires Sun Microsystems and leads development of OpenOffice.org
2010 (2011?): Because of Oracle's acquisition of OpenOffice.org, the source code base of OpenOffice.org is forked. Libre Office is born, hosted by Document Foundation.