Parallel conferences

Hi! I'm totally confused with all I've read on website and in community. I don't get the difference between conferences, meetings, events, sessions, etc, as well as licenced users/premium accounts💀.

My goal is just to be able to host 2 conferences at once from different computers - my friend and I are both teachers and want to host overlapping meetings with no time or attendees limit.

What's our cheapest and easiest option? The business plan or?

Thanks in advance!