Our Sages teach that Moshe Rabeinu had some difficulty understanding how the half a coin contribution would atone for the Jews , until Hashem showed him a sample out of fire.
But this is not on the list of 3 other items that he also needed help with -
The Menorah
The New Moon
& the laws of insects that are not Kosher.
What is the difference ?
Now may be a good time for a gem of Torah study.
www.GemsofTorah.com