🧵 How to Create an ERC20 Token in Solidity

Want to launch your own token on Ethereum?
Here’s a complete step-by-step guide to writing and deploying an ERC20 token using Solidity + OpenZeppelin.

Let’s get started 👇

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1/ What’s an ERC20 Token?

ERC20 is the most widely adopted standard for fungible tokens on Ethereum.

Think stablecoins like $USDC or governance tokens like $UNI.

Every ERC20 follows a shared interface so wallets, exchanges & dApps just work with it.

2/ Why ERC20 matters

🔁 Fungible: 1 token = 1 token
🛠 Interoperable: Plug & play with MetaMask, Uniswap, Aave
🧱 Composable: Base layer for DAOs, dApps, staking, governance

Common use cases:

- Stablecoins
- DAO tokens
- Reward points
- Game assets

3/ Key Functions in ERC20

Here's what every ERC20 token must (or should) implement:

4/ Writing Your Token in Solidity

Use OpenZeppelin – it's secure and audited.

Here’s a simple ERC20 token with optional minting:

5/ Local vs Browser Dev (both great for beginners)

👨‍💻 Remix (http://remix.ethereum.org)

Zero setup

⚙️ Scaffold-ETH 2 + Hardhat

Full-stack dev env

Great for scaling up

7/ How ERC20 Transfers Work

✅ Direct token transfer - 🔄 transfer(to, amount)

✅ Delegated transfer (like Uniswap pulling tokens)
- approve(spender, amount)
- transferFrom(from, to, amount)

6/ Deployment Flow

1. Compile the contract (yarn compile or Remix)

2. Deploy it with constructor args (name, symbol, supply)

3. Get contract address

4. Add token to MetaMask

5. Interact via frontend / block explorer / CLI

5/ Local vs Browser Dev (both great for beginners)

👨‍💻 Remix (http://remix.ethereum.org)

Zero setup

⚙️ Scaffold-ETH 2 + Hardhat

Full-stack dev env

Great for scaling up
https://scaffoldeth.io/