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.
when market circumstances do not determine, we need to keep them from experiencing the fall or decline that will occur. usually, I use coins as best I can to keep them safer. besides that, I also hold it for a long time again coin safe and not until down or fall.