No rule for this one
No ending or word group predicts the article of Geld. Learn it as a pair and say it out loud: das Geld.
das Geld
It's das Geld. Geld is neuter.
Ich habe kein Geld dabei.
I don't have money with me.
No ending or word group predicts the article of Geld. Learn it as a pair and say it out loud: das Geld.