Security of your websites, email, and web space is extremely important, to keep your Joomla website secure first you need adequate, reliable and secure hosting, combined with adequate passwords for hosting, FTP, Joomla, and databases.
A lot of different languages are available for the Back-end, but by default this language may not be installed. If you want a translated Back-end, get your language pack and install it using the Extension Installer.
When you Archive an Article, the content is put into a state which removes it from your site as published content. The Article is still available from within the Control Panel and can be retrieved for editing or republishing purposes.
The collation option determines the way ordering in the database is done. In languages that use special characters, for instance the German umlaut, the database collation determines the sorting order.