Mainnet docs are version-pinned. Check each section's exact version in the sidebar; it can lag the newest upstream release.
Fuel toolchain Please visit the Fuel Installation Guide to install the Fuel toolchain binaries and prerequisites.
Check out the Developer Quickstart Guide for a step-by-step guide on building a fullstack dapp on Fuel. The guide will walk you through writing a smart contract, setting up a wallet, and building a frontend to interact with your contract.