I'd say it's pretty safe. It's my first DeFi as well. The LeoFinance team has a proven track record. I don't know anything about the other DeFi projects, but I would say I trust the CubDeFi more. There is always risk. Maybe there is a flaw in a smart contract (although unlikely), but smart contracts can't be broken. The Cub contracts have been audited, report to come out shortly.