How does a blockchain work? Simply Explained!

Hi everyone!

I'm trying to make some video's to explain the basic concepts of cryptocurrencies.

My first one is about how Blockchains work:
https://www.youtube.com/watch?v=SSo_EIwHSd4

What do you think?

I'm also looking for suggestions for future video's. What topics did you struggle to understand when you got into crypto for the first time?