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.
Yes that is right we get experience with the passage of time and after getting some good lessons, i think that the most common mistake that we make in bitcoin taking is not to take a right decision in a right time time which in fact create a big problem for us. If fact we can overcome such mistake after passage of time.