Simple Smart contract without any extra function best way to avoid exploit

[Yoshiko]

If you're new follow this guide, you will need to use hardhat.

OpenZeppelin Upgrades: Step by Step Tutorial for Hardhat

[cover_upgrades_plugins] OpenZeppelin Hardhat Upgrades Smart contracts deployed with the OpenZeppelin Upgrades plugins can be upgraded to modify their code, while preserving their address, state, and balance. This allows you to iteratively add new features to your project, or fix any bugs you may find in production. In this guide, we will show the lifecycle using OpenZeppelin Hardhat Upgrades and Gnosis Safe from creating, testing and deploying, all the way through to upgrading with Gnosis Sa…

You might want to follow the hardhat guide first.

Hardhat's tutorial for beginners | Ethereum development environment for...