No coin is safe for investment, no guarantee there, if you are beginer and don't know about investment in cryptocurreny, you need learn more about it, because every something have a risk, seem like your wallet can be hacked, the coins price can go down and etc, if you already know about investment in cryptocurrency, I sugest you to imvest in Ethereum, because there is many users, and many company choose it, for example for bounty, airdrop and etc. I think this help you