People all over the world keep their keys in a safe place. Because any key is used to re-launch a website or wallet. So I think they are needed in any situation. Should be kept in a safe place. Which cannot be shared with anyone else. Because there are lots of users who can do harm. Try to keep the information confidential.
based on experience do not also trust close people who are also involved in crypto, usually those who are nosy do commendable deeds so that we think we have been hacked, but not at all, trying to create a new wallet.
Actually, there are many ways to be really safe, I used to save a private key but now change it to save the JSON file because I think it is safer and we can store it safely anywhere because every time you want to open a JSON file you are required to enter a password. after that combine it with metamask to see every progress of our token.