Bitcoin is peer-to-peer digital cash , in other words, money.
To understand Bitcoin, you first need to understand what money is. That’s why it’s best to start by studying the concept of money itself: what are its functions, how is it used in human society, what forms of money have existed throughout history, how and why people choose a particular form of money, why gold "won" in the monetary evolution and was used for thousands of years, why it stopped being money, and how banks and today’s fiat currencies issued by central banks came into existence.

This topic is incredibly broad and complex. It requires at least a thousand hours of dedicated study to truly understand what Bitcoin is and why it matters.

A great starting point for anyone serious about learning is to read books like:

“The Bitcoin Standard” by Saifedean Ammous

“Broken Money” by Lyn Alden

Both books explore not just Bitcoin, but also the history, evolution, and role of money in human civilization.