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How to Write a Smart Contract in Solidity (2025 Tutorial)

Smart Contracts
2025-05-05
Author:Jyotvir
How to Write a Smart Contract in Solidity (2025 Tutorial)

Learn how to write a smart contract in Solidity with Remix IDE. Covers HelloWorld, ERC-20 tokens, testing, and mainnet deployment for EVM developers in 2025.

Frequently Asked Questions

Use a recent 0.8.x release: 0.8.26 or later was current in May 2025. The 0.8 line introduced built-in overflow checks and custom errors. Always pin your pragma (e.g. `pragma solidity 0.8.26;`) rather than using a floating caret for production contracts.
Yes. Remix (remix.ethereum.org) remains the fastest zero-install way to write, compile, and deploy Solidity. It includes the Solidity compiler, a JavaScript VM for local testing, MetaMask injection for testnet deploys, and a built-in static analyzer. Most developers graduate to Foundry or Hardhat for larger projects.
No. Remix's JavaScript VM simulates deployments with zero cost. For testnet deploys on Sepolia or Holesky you need testnet ETH from a faucet, which is free. Real gas costs apply only on Ethereum mainnet or other live L1/L2 networks.
`storage` is persistent on-chain state and costs the most gas to modify. `memory` is a temporary in-function buffer, cleared after the call. `calldata` is a read-only area holding function arguments for external calls: it is the cheapest and should be preferred for external function parameters that are not mutated.
Use OpenZeppelin Contracts for anything going to production. Its ERC-20 implementation is audited, battle-tested, and covers edge cases (return values, allowance race conditions) that a hand-rolled token usually misses. Writing your own ERC-20 is a valuable learning exercise but a liability in production.

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Tags:

how to write smart contract Solidity

Solidity tutorial

smart contract development

Remix IDE

ERC-20

Web3 Developer Tooling

2025

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