Blockchain, web3, NFT, crypto 🦄

There are plenty of web3 tutorials every where. We strive to save you time, give you the most useful materials, and make it beginner friendly.

Web3 Programming Language : We will need JavaScript (and JavaScript framework React) to develop web3 applications. A little bit of HTML, CSS, JavaScript will go a long way in web3 programming. Prerequisite for web3 developer is JavaScript and general front end skills. React is very helpful for building modern web apps fast with good UI. Web3 Libraries you should know : web3 libraries to know about. web3 libraries to know about 02 How to get started with Blockchain and Ethereum? Why JavaScript? But web3 is about so much more than just JavaScript. Tech Stack of Web3

Solidity : JavaScript is the language for web3 APIs, and solidity is the language for smart contracts that power blockchain transactions including transfer of tokens and NFTs between wallets (addresses).

Future of web3 Web3 is the future of the internet, but the future right now has an UIUX problem. It's hard for novices to understand how to transact, stay safe from fraud. And the gas fee for transactions is exorbitant.

Blockchain scaling problem Scaling is an engineering problem that every blockchain company cares deeply about.

Development Environment, Developer Tools

• "Blockchain is a distributed digital ledger that stores data of any kind. A blockchain can record information about cryptocurrency transactions, NFT ownership or DeFi smart contracts." - Forbes. What's Blockchain? David Rodeck,  John Schmidt "The opposite of decentralized is centralized E.g data center hosts huge amount of data."
• Hardhat : "Ethereum development environment for professionals" - Hardhat documentation. Getting started with Hardhat. There are two options for JavaScript: vanilla JavaScript and TypeScript. "Hardhat is a development environment to compile, deploy, test, and debug your Ethereum software. It helps developers when building smart contracts and dApps locally before deploying to the live chain." - alchemy doc
• Ganache: Ganache: a local blockchain for development, testing, experimentation.
• What is Ganache? Read our detailed Ganache intro flash card here
• Metamask. Has a 3D fox logo, holds Ethereum (ETH). Metamask wallet can be used as a mobile wallet or chrome browser. We don't know how secure it is, and how to keep it secure, but we know that some of the good NFTs use it and it is likely the most commonly used wallet. Can interact with any ERC-20 compatible blockchains. Can hold ERC-20 compatible tokens, testnet tokens and polygon chain tokens. Caution : read our disclaimer and warnings. User error may result in loss of tokens and NFTs. It's very important to do your own research on how to use metamask securely.
• A node (the computer in the network of blockchain nodes) is not a database, there’s no native data query API. Because of the distributed nature of blockchain, even summing up (adding up, simple math) the transactions is a difficult if not impossible task. It will at least take a long while.
• "Nodes: the computers that run and supports the blockchain ledger. The nodes form a network together … The digital ledger is often described as a 'chain' that’s made up of individual “blocks” of data." - Forbes. What's Blockchain? David Rodeck,  John Schmidt

Wallet : Connect wallet, security issue when connecting wallet.

KPI of blockchain : hash rate, a proxy for the network’s compute power, measured in unit of GH/s, ETH reached 812,769 GH/s in 2021 (etherscan + decrypt)

Smart Contract : What does a smart contract actually look like?

Free operations, no gas fee: anything that does not require changes to the blockchain, such as reading blockchain, contracts, accounts data etc.

"The public key (commonly shortened to pubkey) is known as the wallet's receiving address or simply its address. The wallet address may be shared and displayed freely. When another party is going to send some amount of cryptocurrency to a wallet, they need to know the wallet's receiving address. Depending on a blockchain's implementation, the address can also be used to view certain information about a wallet, such as viewing the balance, but has no ability to change anything about the wallet or withdraw any tokens. The private key is required to digitally sign any transactions to send cryptocurrencies to another address or to make any changes to the wallet. The private key must never be shared. If someone gains access to the private key to a wallet, they can withdraw all the tokens it contains. If the private key for a wallet is lost, any tokens that have been sent to that wallet's address are permanently lost." - solana presentations

Comment : That's a huge difference between traditional wallets and crypto wallets. For traditional accounts, people need to know both your username and password combo, even two factor authentication. But for crypto wallet, you just need the pass phrase. That's pretty easy to steal, scam.

Comment: there are also disadvantages of sharing public address. If your real personal info is associated with crypto wallet addresses what you do is no longer anonymous