gehören
to belong to
To be in someone's possession; to be someone's property.
Wem gehört dieser Schirm?
Who does this umbrella belong to?

to belong
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to belong to
To be in someone's possession; to be someone's property.
Wem gehört dieser Schirm?
Who does this umbrella belong to?

To express possession, the person something belongs to is always in the dative. The object that is owned is the subject of the sentence.
Das Fahrrad gehört meinem Bruder.
The bicycle belongs to my brother.
When 'gehören' (to belong) means to be part of a group or category, it is always used with the preposition 'zu' and the dative.
Dieses Thema gehört nicht zur Prüfung.
This topic is not part of the exam.
To express that something belongs in a specific place, use 'gehören' (to belong) followed by a location phrase, usually with a preposition such as 'in', 'auf', or 'an'.
Die Bücher gehören zurück ins Regal.
The books belong back on the shelf.
The expression 'es gehört sich' (it is proper) is an impersonal phrase used to talk about good manners or social rules. The 'es' is a fixed part of it.
Es gehört sich, „Danke“ zu sagen, wenn man ein Geschenk bekommt.
It is proper to say 'thank you' when you receive a gift.
to have
'haben' and 'gehören' can both express possession. The difference is in the perspective. With 'haben', you say who owns something or has it with them: 'Ich habe ein Fahrrad.' (I have a bicycle.) With 'gehören', you say whom something belongs to: 'Das Fahrrad gehört mir.' (The bicycle belongs to me.) Learners often confuse the words because both describe the same situation of possession. A practical tip: with 'haben', the person is usually the subject; with 'gehören', the thing is usually the subject.

Der rote Rucksack gehört dem neuen Schüler.
The red backpack belongs to the new student.
Meine Kollegin hat morgen einen Termin in der Stadt.
My colleague has an appointment in town tomorrow.