The article focuses on order book basics of matching buyers and sellers, which is a pretty small part of "understanding the stock market" for anyone who wants t

The article focuses on order book basics of matching buyers and sellers, which is a pretty small part of "understanding the stock market" for anyone who wants to invest. I would also look at long-term history, business cycle (in the stock market terms), inflation and rates, liquidity crises as a background for investing. Those are much more valuable for an investor than order book details. My 2c.