• The Hitchhiker's Guide to Smart Contracts
• part1 - crud-part-2-ed8d8b4f74ec), [part3](https://medium.com/robhitchens/solidity-crud-epilogue-e563e794fde)
• Airdrops
• HD Wallet explained
• CryptoZombies: Learn to Code Ethereum DApps By Building Your Own Game
• What's Solidity?
• Building a fully decentralized User profile app on Ethereum and IPFS
• Airdrops
• The Hitchhiker's Guide to Smart Contracts
• Airdrops
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Tutorials

• Ethernaut - Smart Contract Hacking Game
• Hack This Contract Game
• Ethereum and Solidity: The Complete Developer's Guide
• Become a Blockchain Developer with Ethereum and Solidity
• Creating your own DAO based on Aragon framework
• Test Driven Development for Solidity
• Kauri - to-date tutorials and tips on How to build on Ethereum

Short answers to some questions

• "Indexed" keyword / filtering logs
• Execution of Fallback function with more 2300 gas

News

• ICO Alert
• Dappradar

Concepts

• Blockchain Oracles, Explained
• ABI
• Keccak256
• A Closer Look At Ethereum Signatures
• Web 3.0 Explained
• Random numbers
• Velocity of Tokens

Blogs

• ConsenSys
• Sarah Baker Mills
• David Rugendyke
• Alex Sherbuck
• Matthew Di Ferrante
• Philippe Castonguay
• Elena Dimitrova
• Aragon techblog
• Eric Elliot's blog about blockchain

• known attacks
• 1
• 2 - analysis-of-a-couple-ethereum-honeypot-contracts-5c07c95b0a8d)
• Integer Overflow (i.e., proxyOverflow Bug)
• The DAO Hack
• Parity Wallet Hack
• How $800K Evaporated from PoWH Ponzi

Known hacks

• Parity Wallet Hack II

Blogs

• 1

Security

• Exceptions on overflow

Gas spending

• How to write an optimized (gas-cost) smart contract?
• Gas Costs from Yellow paper
• Under-Optimized Smart Contracts Devour Your Money
• public vs external

Common design principles

• Off-Chain Whitelist with On-Chain Verification for Ethereum Smart Contracts
• Library Driven Development in Solidity
• Reversing Ethereum Smart Contracts
• A Crash Course for Mechanism Design

ERCs

• ERC-20 - original token contract for fungible assets [ [The Anatomy of ERC20](https://medium.com/blockchannel/the-anatomy-of-erc20-c9e5c5ff1d02) / [Example](https://theethereum.wiki/w/index.php/ERC20_Token_Standard) ]
• ERC-165 - creates a standard method to publish and detect what interfaces a smart contract implements
• ERC-173 - a standard interface for ownership of contracts
• ERC-223
• ERC-721 - token standard for non-fungible assets [ [Walking Through the ERC721 Full Implementation
• ERC-725 - proxy contract for key management and execution, to establish a Blockchain identity
• ERC-827
• ERC-875 - for non fungible tokens and simple atomic swaps
• ERC-918 - mineable Token Standard
• ERC Token Standards for Dummies, Like Me

EIPs

• Ethereum Natural Specification Format
• EIP821
• A New Advanced Token Standard

Other

• Style Guide

Standard contracts

• OpenZeppelin Contracts
• OpenZeppelin Base Tokens
• aragonOS
• Status.im Crowdsale
• 0x - DEX protocol

Utils

• SafeMath
• Easily Send Many Tokens to Many Addresses
• BytesHelper - library to deal with bytes32

Utils

• Bitwise Operations and Bit Manipulation in Solidity, Ethereum
• Not so smart contracts
• BDD approach in testing
• Memory vs Storage & How to initialize an array inside a struct
• Multisig contracts
• Self-balancing binary search trees - BST adapted for Solidity and EVM

Testing tools

• TestRPC

Development tools

• Docker images - env) - Solidity testing environment from us (Blockchain Labs, NZ)
• 11 Best Ethereum Development Tools
• Solidity syntax highlighting on Github

Test Ether faucets

• Rinkeby faucet
• Ropsten faucet

Online services

• Ethereum gas station
• Ethereum unit converter
• Ethereum unit converter
• Ethereum unit converter

Storage

• IPFS - Decentralised storage and file referencing
• IPFS-Store - IPFS Storage service with added search capability
• OrbitDB - Decentralised database on top of IPFS
• Infura API - Another API to IPFS
• Swarm - Distributed storage platform and content distribution service, a native base layer service of the Ethereum web3 stack
• Filecoin
• Infura API - Another API to IPFS

Online services

• Web3 Design principles
• Blockchain Design Principles
• How to create a DApp using Truffle, Oraclize, ethereum-bridge and Webpack
• Create Blockchain Dapp with Ethereum and VueJS

Design

• Designing for the blockchain

Private networks

• Parity Demo-PoA Tutorial - Step-by-Step tutorial for building a PoA test chain with 2 nodes with Parity authority round consensus
• Kaleido - Use Kaleido for spinning up a consortium blockchain network. Great for PoCs and testing

React / Redux

• Vortex - A Dapp-ready Redux Store. Smart and Dynamic background data refresh thanks to WebSockets. Works with Truffle and Embark.

APIs / subproviders

• Eth.js - Javascript Web3 alternative
• Web3Wrapper - Typescript Web3 alternative
• Ethereumjs - A collection of utility functions for Ethereum like ethereumjs-util and ethereumjs-tx
• Subproviders - Several useful subproviders to use in conjunction with Web3-provider-engine (including a LedgerSubprovider for adding Ledger hardware wallet support to your dApp)
• Nethereum - .Net Web3
• Web3.hs - Haskell Web3
• Ethereumex - Elixir JSON-RPC client for the Ethereum blockchain