How to check if someone is allowed to transfer an amount of BTC from one account to another?
How was the BTC technology designed to prevent against double spends and all kinds of other questions?
What is it that miners do exactly?
..and several other questions are explained in a clear way in this very informative video.
One question that remains (for myself), is why people say that the value of BTC will increase because there is a finite amount of BTC, while you can do transactions up to something like 9 decimals?