
passend
suitable
To be suitable or appropriate for a particular purpose, situation, or person.
Das war genau die passende Antwort auf seine unverschämte Frage.
That was exactly the suitable answer to his rude question.
suitable / fitting
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suitable
To be suitable or appropriate for a particular purpose, situation, or person.
Das war genau die passende Antwort auf seine unverschämte Frage.
That was exactly the suitable answer to his rude question.

fitting
To have the right size, shape, or fit, especially with clothing or objects that are joined together.
Die Schuhe sind schön, aber leider nicht in meiner passenden Größe verfügbar.
The shoes are nice, but unfortunately not available in my fitting size.
'Passend' (suitable / fitting) is the present participle form of the verb 'passen' (to fit / to suit). When something 'passt' (that is, is suitable or has the right size), then it is 'passend'. This origin helps you understand the meaning.
Ich suche noch ein passendes Geschenk für meine Mutter.
I'm still looking for a suitable gift for my mother.
Whether 'passend' means 'geeignet' (suitable) or 'von der richtigen Größe' (of the right size) can be recognized from context. With abstract things like moments or answers, it means 'suitable'. With concrete things like clothes or keys, it means 'having the right size/shape'.
Das ist der passende Moment, um die Neuigkeit zu verkünden.
This is the suitable moment to announce the news.
In the meaning 'geeignet' (suitable), 'passend' is often combined with the prepositions 'für' (+ accusative) or 'zu' (+ dative). 'Für' describes the purpose, while 'zu' describes the combination with something else.
Dieses Hotel ist passend für Familien mit Kindern.
This hotel is suitable for families with children.
correct / right
Richtig and passend can both express that something is suitable for a purpose or situation. Passend specifically emphasizes suitability or appropriateness, while richtig can be more general or carry the nuance of “ideal.” Use passend when the specific suitability is the main focus.

Für die wenigen Gäste ist dieser kleine Topf passend.
This small pot is suitable for the few guests.
Für die vielen Gäste ist dieser große Topf die richtige Wahl.
For the many guests, this large pot is the right choice.