Phrase · 🙏 Thanking, apologising and being polite

—Gracias por tu ayuda. —No hay de qué.

—Thanks for your help. —Don't mention it.

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Why every word is where it is

—Gracias1nounthanksfem. · pl.por1prepositionfortu2determineryour2nd sing.ayudanounhelpfem. · sing..—No3adverbnothay3verbthere ishaber · present · 3rd sing.de3prepositionofqué3pronounwhat.

Gracias → ayuda: thanks for what?
tu → ayuda: possessive + noun
No → qué: no hay de qué = don't mention it

Why it's built this way

The notes match the numbers above.

1
gracias por + noun or infinitive = thanks for…
2
tu ayuda = your help (tú); with usted: su ayuda. Possessive determiners: mi, tu, su, nuestro →
3
No hay de qué = don't mention it: a fixed reply, a little more formal than de nada.

Variations

—Gracias por todo. —No hay de qué.
—Muchas gracias por su ayuda. —Con gusto.