[1] Don't store your coins on exchanges for too long. It is the most stupid mistake
Rather, we should not keep our coins on exchanges only. We should create a cold wallet and store our coins there. We will have full control of our wallet.
[2] Don't use wallets that you don't have full control of wallet's private keys.
We can use hardware wallets where you will have access to your private keys. It is safe, unless you loose it.
[7] Don't store your coins on mixing service platforms for too long. Withdraw them immediately after mixing process finished
I didn't understand this point. What is mixing service platforms?