Most of the mistakes you mentioned above are usually associated with crypto currency newbies of which at the end they learn a hard lesson from their mistake. And in addition to your submission above, i will like to that is very risky for keep his or her money in an exchange wallet for a long time.
Some newbies never learn their lesson for different reasons, some newbies make so many mistakes at the beginning and lose so much money that they never get in bitcoin again, so they never learn their lesson and another group of newbies make so many mistakes they decide to try to recover their money and as a result they make even more mistakes and run out of money and do not have the possibility to correct their mistakes anymore.