Are you talking about the bitcoin's blockchain or your own wallet's security ? Speaking about the blockchain, bitcoin is one of the most safest asset in the world and you dont need to worry about that a single percent. And about your btc wallet, it depends on your system and yourself. Keep the software and pc clean and you should be just fine. Alternatively, use a hardware wallet if you cant handle a PC well and you can't understand the difference between malicious links and safe links.