to be good for
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to be any good
To be suitable, useful, or of sufficient quality for a particular purpose. Very often used in the negative form ('nichts taugen' — to be no good) to express that something is unusable or bad.
Der alte Rasenmäher taugt nichts mehr, wir brauchen einen neuen.
The old lawn mower is no good anymore; we need a new one.
This verb is very often used in the negative form 'nichts taugen' (to be no good) or 'nicht viel taugen' (to not be much good). This expresses that something is unusable, bad, or of low quality.
Seine billige Kamera hat noch nie etwas getaugt.
His cheap camera has never been any good.
When you want to express that a person is suited for a particular role or task, you use the structure 'taugen zu etwas' (to be suited for something). Here, 'etwas' is in the dative.
Er ist ein guter Sportler, aber zum Teamkapitän taugt er nicht.
He is a good athlete, but he is not suited to being team captain.
The expression 'nichts taugen' (to be no good) is part of everyday language and can sound very direct and critical. In formal situations, one would often choose a different phrasing.
Ganz ehrlich, dein Plan taugt nichts.
Honestly, your plan is no good.
to fit / suit / pass
'passen' and 'taugen' can both express that something is suitable for a purpose. 'passen' is neutral and very common: it means that something suits a situation, a plan, or a person. 'taugen' puts more emphasis on quality or usefulness. It often sounds a bit more direct and is very often used in the negative, for example 'Das taugt nichts' (That's no good). Learners may confuse the words because both have to do with suitability. 'passen' is more like asking: Does it suit the situation? 'taugen' is more like asking: Is it useful or good enough for that?
Diese alten Bretter taugen nicht mehr für den Gartenzaun.
These old boards are no longer any good for the garden fence.
Nach dem Gespräch passt der neue Plan für alle besser.
After the discussion, the new plan suits everyone better.