ERC-20 Token Basics:
ERC-20 is a standard for fungible tokens on Ethereum.
Sample Token Contract:
solidity

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import “@openzeppelin/contracts/token/ERC20/ERC20.sol”;

contract MyToken is ERC20 {
constructor(uint256 initialSupply) ERC20(“MyToken”, “MTK”) {
_mint(msg.sender, initialSupply * (10 ** decimals()));
}
}

Steps:
Use Remix → enable OpenZeppelin in the plugin manager

Paste the contract and deploy

Test transfers using MetaMask and Remix

Real Use:
Community rewards

In-app currencies

ICOs and fundraising