2. Do not back up your wallet
3. Do not research new services
4. Buy and sell based on feelings
5. Leave your money in the electronic money floor
Second thing is a big factor that i think that most of people about 60%+ are not using because this is that option where we can recover the wallet event if we lost the wallet password and identifier .
But if anyone not made these things aware then it is more better option for him to get private key of his wallet and then print out at paper and store in offline and also he can save in the online because saving private key is not a big option but puting at bettet place is a better option should be recruired .
Here i am shocked that no one 1-2 years old bitcoiners in my network knows about the bitcoin private key because they were using to store and withdrawal direct Wallet and they are not making research on new service (line 3rd of the OP post ) .