Which is the safest online wallet?

As a cryptocurrency enthusiast, I'm constantly on the lookout for secure storage solutions. With so many options available, it's difficult to determine which online wallet offers the highest level of safety. Could you elaborate on what makes an online wallet truly secure? What factors should I consider when evaluating the safety of a wallet? Are there any specific features or technologies that are industry-standard for ensuring the security of digital assets? Additionally, are there any well-known and trusted online wallets that you would recommend? I'm eager to learn more about how to protect my cryptocurrency investments.