Whether we are referring to our stuff on a nearby chair or a serious matter that needs to be discussed, there are several words in German that can be helpful. Most of them can be used in a number of contexts, but there are a few things to be aware of.
Sachen is a very versatile word, and can be used to refer to physical items but also matters and topics. Of course, das Thema is a more common word for "the topic."
Und ja, ich räume meine Sachen nicht immer sofort weg.
And yes, I don't always clean up my stuff away right away.
Caption 29, Die Wohngemeinschaft - Probleme
Play Caption
Hier gibt es viele verschiedene Sachen für die Familie und für die Kinder zu sehen.
Here there are many different things for the family and for the children to see.
Caption 8, Berlin - Domäne Dahlem
Play Caption
Fazit: In Sachen Hamburger hat die Hauptstadt auf jeden Fall mehr zu bieten.
Conclusion: When it comes to hamburgers, the capital city definitely has more to offer.
Caption 25, Berlin - Die beste Auswahl an Hamburgern
Play Caption
Der Gegenstand is used to refer to a physical object or item, but also a topic of conversation or debate. And, of course, there is also the word das Objekt. In shopping, der Artikel ("the item") and die Ware are more likely to be used.
Auch hier handelt es sich um einen runden Gegenstand.
Also here it is about a round object.
Caption 34, Eva zeigt uns - Formen
Play Caption
Slang terms for "stuff" or "odds and ends" are der Kram and das Zeug.
So viele Spinnweben und so viel Kram
So many cobwebs and so much stuff
Caption 11, Silbermond - Leichtes Gepäck
Play Caption
Diese Box wird für Bücher, dieser Karton wird für das Zeug aus der Küche sein.
This box will be for books, this carton will be for stuff from the kitchen.
Caption 14, Drei Leute - beim Kofferpacken
Play Caption
The word das Ding is, of course, also commonly used, and not just for objects.
Wir testen die Dinger jetzt schon seit Monaten.
We've been testing the things for months already.
Caption 30, Die Stunde der Offiziere - Dokudrama über den 20. Juli 1944
Play Caption
Ich habe entschieden, die Dinge selbst in die Hände [sic, Hand] zu nehmen.
I have decided to take matters into my own hands.
Caption 6, Berufsleben - Probleme mit Mitarbeitern
Play Caption
The plural forms die Dinger and die Dinge are both used. Generally, die Dinger refers to multiple things of the same kind, whereas die Dinge refers to multiple things of different kinds.
Further Learning
Das Thema, die Sache, das Objekt, der Artikel, die Ware, der Gegenstand, der Kram, das Zeug, and das Ding: Yabla German has many examples of all of these words, as they are commonly used. Go through them and make sure you know which are only used for non-physical ideas, topics, and matters, which are exclusively for physical objects, and which are applicable in both contexts. Making a venn diagram may be a good strategy!