The security of blockchain oracles is crucial for Web3, as secure oracles enable a range of decentralized applications by reducing counterparty risk and facilitating smooth value exchange. Developers integrating financial market data into DeFi applications must ensure oracles are tamper-proof and consider the quality and resilience of the connected markets. The text explores the differences between market manipulation and oracle manipulation, detailing how Chainlink Price Feeds provide comprehensive market price coverage and enhance application security. Market manipulation involves artificially affecting asset prices through supply-demand imbalances, especially in low-liquidity markets, while oracle manipulation results from reporting incorrect external data, either intentionally or due to data source issues. Chainlink Price Feeds help protect dApps from oracle attacks through decentralization, reliable node operators, and defense strategies, while developers are advised to integrate Chainlink for tamper-proof data and evaluate asset quality to mitigate risks. Additionally, applying mechanisms like circuit breakers and monitoring are essential for maintaining dApp security and promoting DeFi's mainstream adoption.