Yisro meets up with Moshe and helped Moshe setup a system for judging people, where as questions got more advanced they'd get answered by higher level scholars, until only the most advanced ones got answered by Moshe
so everyone could get their questions answered
On the first day of Sivan the yidden arrived at mount sinai and Moshe ascended the mountain for the first time
to converse with hashem
the Yidden heard the first 2 of the 10 commandments directly from Hashem and the last 8 they heard through Moshe
for when hashem spoke the people's souls would leave them