_You can follow along with the video course from here._ ### Introduction This section covered how to deploy contracts, how to import and interact with them, and using inheritance to customize their functionalities. ### Deploying and importing We delved into the use of the **`new`** keyword to deploy multiple instances of a contract, allowing for the creation of numerous contract instances as needed. Contracts can also be **imported**, which is equivalent to copying the code into the file but with the advantage of enhanced code reusability and modularity. It's good practice to use _named imports_, selecting only the contracts we intend to use from the file. ```solidity import { Contract as MyContract } from './myOtherContract.sol'; ``` ### Contracts interaction Solidity lets you interact with other contracts. To do so we need the contract's address and its ABI (Application Binary Interface): ```solidity contract AddFiveStorage is SimpleStorage {} ``` ### Inheritance and overriding A contract can also derive functions from other contracts through **inheritance**. This can be obtained through the `is` keyword. To explicitly override a function from the parent contract, the `override` keyword is used in the child method. The parent's function must be marked as `virtual` to allow this interaction. ```solidity //child contract import './ParentContract.sol'; contract ChildContract is ParentContract { function store(uint256 _num) public override {} } ``` ```solidity //parent contract function store(uint256 _num) public virtual { // function body } ``` ### Conclusion In this section, we explored deploying multiple contract instances using the `new` keyword and enhancing code reusability through contract _imports_. We also covered interacting with other contracts using their address and ABI. Additionally, we learned about inheritance and function overriding, allowing derived contracts to customize inherited functionalities. 💡 **TIP**:br When you finish a section, take a moment to acknowledge your progress, celebrate it and share your achievements with your community. ### 🧑‍💻 Test yourself 🏆 Attempt to answer all the theoretical questions from lesson 1 through 7, and then go back again to complete all the coding tasks.