What is the best methods to protect altcoin from hacker?
take care of your private key, passwords and dont click any suspicious link that has been sent to you through pm, shared on any social media sites, etc. the only reason why hackers have the access on your account is because they successfully get your key.
I myself to keep my coins in this uncertain market circumstance I often use how to hold. because I think by holding the coins I have become safer. if for coins that will have threatened to collapse before I invest. both of which are well suited for keeping the coins in both the short and long term.