The biggest risk is that the token you're staking drops in price. Staking rewards of 10% APY don't help if the token loses 50% of its value. Only stake assets you're comfortable holding long-term.
2Slashing risk
Validators can be penalized (slashed) for misbehavior such as double-signing or going offline. Some of your staked tokens can be burned. Using reputable validators with strong track records minimizes this.
3Smart contract risk
DeFi and liquid staking protocols run on smart contracts which can have bugs. Major hacks have resulted in total loss of funds. Stick to audited, battle-tested protocols and diversify across platforms.
4Liquidity risk
Some native staking has unbonding periods of days to weeks. If you need to sell quickly during a market crash, you may be stuck. Liquid staking solves this but introduces depeg risk instead.