Pretty good article showing how the ETF came into existence and how they work. It describes the problems with etf, the lack of liquidity when high volatility, b

Pretty good article showing how the ETF came into existence and how they work. It describes the problems with etf, the lack of liquidity when high volatility, but could have written a bit more about NAV (Net asset value). ETFs usually trade in parity with NAV but in march 2020 there were cases with big divergence often coupled with lots of forced selling.