In this chapter, we will cover the following recipes:

• Handling errors properly in solidity
• Abstract and interface contracts
• Managing contracts from other contracts
• Contract inheritance in solidity
• Creating libraries in solidity
• Mathematical and cryptographic functions in solidity
• Creating upgradable smart contracts
• Fetching data from APIs using solidity
• Function as a type in solidity
• Understanding solidity assembly
• Implementing multisig wallets in solidity