Ethereum - smart contracts run on top of Ethereum Virtual Machine. Each state change is “saved” to the blockchain, but not to the memory of the single computer.
Very good list of Blockchain resources is available here (but don’t stop to read this document!) -https://a16z.com/2018/02/10/crypto-readings-resources/
**Very good book that is must read for any blockchain developer. Currently Ethereum uses same crypto-consensus algorithm, just like Bitcoin does. There is no necessity to read the whole book, you can skip chapters and sections.
Ethereum smart contracts guide is available here - https://github.com/ethereum/guide
Research the https://www.myetherwallet.com - generate new wallet
Create coinbase account -very easy way to keep you crypto (but please don’t keep a lot! you can loose your money, because the service is centralized; also it can be hacked).
Check how block Explorer works -http://etherscan.io/ - see you transaction
install geth and start it from your console
install parity and start it from your console (kovan or rinkeby testnet) + connect from the browser
Install Mist (Ethereum Wallet) and start syncing it with the mainnet (can take more than 100+ GB on your hdd)
MetaMask chrome add-on
DApp vs ordinary web app
Lightnode, different modes
PoW, PoS, (D)PoS, Raft/Paxos
Differences between decentralization and distributed systems
Block, basic structures
MIner’s fee, rewards
Transaction Maleability attack
Blockchain bloat attack
Will for cycle (read-only iteration) eat gas?
What if the method throws - will gas be eaten?
What if you specified low gaslimit value?
call vs send? What can be called in thefallback functionof the contract? http://ethereum.stackexchange.com/questions/765/what-is-the-difference-between-a-transaction-and-a-call http://ethereum.stackexchange.com/questions/6470/send-vs-call-differences-and-when-to-use-and-when-not-to-use
How to send tx in the Parity, if it stuck? https://kovan.etherscan.io/address/0xdf8845a26e1db43236e591a863289ad5c1fcda5a
mappingsandarrays of mappings? http://ethereum.stackexchange.com/questions/2718/is-it-possible-to-have-mappings-inside-mappings[**
Why new solc version requires ‘payable’ modifier to be specified? Even if no money-consuming operations occur inside the fallback.
Contract address and account address have different formats?
How to startprivatenode? https://blockgeeks.com/how-to-setup-an-ethereum-private-node/
What is PoA (Kovan)?
Is Byzantine generals problem solved?
What happens if you send ETH from the wallet that is not synced?
How to execute arbitrary binary code? Is it even possible? https://github.com/ChainCloud/jibrel-contracts/blob/master/contracts/feature/bytecode/BytecodeExecutor.sol
How to get string hash? https://github.com/ChainCloud/jibrel-contracts/blob/master/contracts/feature/assetid/AssetID.sol
How to pass arrays/strings between contracts? https://gist.github.com/AnthonyAkentiev/68c90721d062b7b21879af7b74b1e95e
pure? view? staticcall? https://medium.com/blockchannel/state-specifiers-and-staticcall-d50d5b2e4920
How to check if address is contract? https://github.com/ethereum/yellowpaper/issues/320
ERC721 (non-fungible token, CryptoKitties) -https://github.com/ethereum/EIPs/issues/721
ERC223 (tokenFallback - receiving tokens callback) -https://github.com/ethereum/EIPs/issues/223