Private key is a keyword or code consisting of many letters which also proves that the private owner of the key has a digital wallet such as ethereum, bitcoin, and so on. Losing the private key can be fatal to your wallet, you may lose the balance and token in the wallet, so keep your key private if you don't want it to happen to you.
As a private key owner, you must be careful of fake sites that want your private key, this case has often happened to some people, they don't know that they have been fooled by scammers. These fake sites can resemble crypto markets, exchange sites, and many other types of sites that are very harmful to your private key, check it out before you enter the site you visit, it is very important for you so that you don't fall into trap of scammers.
Do not let you be easily fooled by someone's trickery, because crime is not only in one room, in social media the criminals do their actions to take your wealth, I have seen a G-Mail that contains a giveaway token, there is a form link available, however ... after I observed that the form contained fake exchange links, this is unfortunate if someone did not know and just handed the private key in the hands of the scammers, it would be very detrimental if we got fooled and lost all the results of the wallet we have.
Save it, do not give your private key to anyone, because the private key that you have is your future, if you lose it, then all your dreams will be forfeited instantly, thank you,
Also just to add to this, a real private key or seed backup is safer than a wallet.dat file that can be easily corrupted (and also keep on a backup device away from the computer, or perhaps two, for safety).