This is the documentation for Plone 5.x, and is updated regularly.
There have been many changes in this version, if you are using Plone 4 do consult the Plone 4.3 Documentation
“Markup” languages like Markdown and RestructuredText are popular with some users,
since they can be written using a keyboard without a mouse or pointing device.
Plone allows these markup languages to be used as text input alternatives, if you so desire.