Can anyone explain to me how “the beacon chain” works in the most simple way?

I have looked up on ETH 2.0 at ethererum.org and understand it to a certain degree but always get lost when they get into the beacon chain and can never seem to wrap my head around it.

I have just started out trading crypto last week and feel like I'm grasping it fairly well although I have no background in computer science (I went to school for accounting) hence why I'm getting lost.