What were the causes of the Great Depression? Where does the blame fall mainly? The narrative still today seems to blame Hoover, but how much can he really be blamed? And, given we know what happened, have we made strides to keep it from happening again?

Not to discourage others from replying but you may be interested in this past comment by u/Integralds about the work by Milton Friedman and Anna Schwartz A Monetary History of the United States. In this they argued, fairly convincingly, that the Great Depression was caused by the US Fed letting the money supply shrink from 1929 to 1933.