Plurals in German
Up till Places 1, the plurals would end with -en but Das Restaurant becomes Die Restaurants. I don't understand why he plural ends in -s when before it was -en.
You have 8 different forms of forming the plural in German. Indeed most of all words ending with an “e” have their plural by adding an “n”. But Plural by adding an “s” is the right form for many other words. I would not try to learn grammatical rules on this topic because there are to many exeptions. Just learn every substantive with its article and its plural. E.g. der Mann, die Männer. Or der Tiger, die Tiger. It is much easier to learn the sound of the language than learning complicated rules in this special case of plural. The brain is able to understand structures also by implicit learning without explicit rules.