1) Only Use Fully-Offline, Air-Gapped, Tamper-Proof, Cold Wallets From Known And Trusted Sources. (i.e., SinisterCrypto.com)
2) Always Do Your Homework And NEVER Expose Your Private Keys!
3) Always Store Your Cryptocurrency On A Trusted Cold Wallet. (NEVER LEAVE YOUR CRYPTO CURRENCY ON AN EXCHANGE OR EXPOSE IT TO ANY HACKABLE CONNECTION!)
4) Never Keep All Your Cryptocurrency Keys Or Backups In A Single Place.
5) Always Store Your Cryptocurrency Private Keys In A Secure Location.
6) Always Back-Up Your Cryptocurrency Private Keys.
7) Make At Least Two Back-Ups Of Your Private Keys.
8) Keep One Back-Up In A Secure Location And The Other In A Secure, Off-Site, Location.
9) Always Use Strong Passwords (With 20 Characters Or More And Private Keys With A Minimum Of A 24-Word Seed Phrase, Stored On A Cold Wallet With A Security Rating Of EAL5 Or Higher).
10) Only Use Trusted, Secure Networks.
11) Never Talk About Your Cryptocurrency Or Investments.