Solidity

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When to Use

• Ethereum/L2s: Developing for Optimism, Arbitrum, Base.
• DeFi: Writing logic for tokens, AMMs, and lending.
• NFTs: ERC-721 and ERC-1155 contracts.

Core Concepts

Gas

Modifiers

modifier onlyOwner { ... }

Events

emit Transfer(from, to, value)

Best Practices (2025)

• Use Foundry: The 2025 standard for testing (Solidity-based tests).
• Use Custom Errors:

  error InsufficientBalance();

  is cheaper than string requires.
• Use OpenZeppelin: Don't roll your own crypto/auth logic.

• Don't ignore reentrancy: Use

  ReentrancyGuard

  or Checks-Effects-Interactions pattern.

References

• Solidity Documentation