All validators are safe to stake on. You can check APY and other details at the following link: https://suiscan.xyz/mainnet/validators.

The best way to stake SUI is by delegating your tokens directly through your preferred Sui-compatible wallet, like Sui Wallet or Ethos, to a validator. When choosing validators, look for high uptime, a reasonable commission rate, and their self-staked amount, which often indicates commitment. It's also wise to diversify your stake across several reputable validators to support network decentralization and mitigate risk.

You can use the Sui wallet directly to stake your SUI.