🔓 Top Threats:
Reentrancy Attacks

Example: DAO hack in 2016

Fix: Use checks-effects-interactions pattern

Integer Overflow/Underflow

Fix: Use SafeMath or Solidity >=0.8 which auto-protects

Unrestricted Access

Fix: Always use require(msg.sender == owner) or modifiers

Front-Running

Fix: Use commit-reveal or off-chain random generation

Best Practices:
Audit your code (use tools like MythX, Slither)

Use OpenZeppelin libraries

Limit gas usage per transaction