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Retr0 Academy
Web3 Fundamentals

Course · Beginner

Web3 Fundamentals

This course is the starting point for Web3 development on NEAR. You will learn how blocks and accounts work, how wallets keep keys, what gas and storage cost, how tokens differ from NFTs, and how Chain Signatures let one NEAR account act on other chains.

0 of 7 lessons complete

What you will build

A clear model of how a blockchain account holds keys and signs transactions, plus a live testnet view call you run in the Playground.

Prerequisites

  • None required. HTML, CSS, and JavaScript in Foundations help when you reach the Playground examples.
Start the course

Lessons

  1. 01What Is a Blockchain?Learn how blocks, hashes, and a network of computers create a shared, tamper-resistant record without a central owner.5 min
  2. 02Wallets, Keys, and Staying SafeHow public keys, private keys, and seed phrases work, plus the safety rules every Web3 developer has to follow.6 min
  3. 03Accounts and Named AccountsNEAR accounts are human-readable names like alice.near, with sub-accounts, implicit accounts, and balances you can read in one RPC call.3 min
  4. 04Transactions, Gas, and StorageWhat is inside a NEAR transaction, how gas pays for computation in Tgas, and how storage staking locks NEAR for the bytes you use.6 min
  5. 05Smart ContractsWhat smart contracts are, how they hold value and run code, and how NEAR runs them as WebAssembly on accounts.6 min
  6. 06Tokens and NFTsFungible tokens vs unique NFTs, ERC-20 and ERC-721 as ideas, and the NEAR standards NEP-141 and NEP-171 — including why a diploma is soulbound.2 min
  7. 07Intents and Chain SignaturesHow one NEAR account can act on Bitcoin, Ethereum, and Solana with Chain Signatures, and what NEAR Intents are for.2 min
Take the Web3 Fundamentals quiz