the Metadata contains the ABI Array, which defines the Interface to interact with the Smart Contract. Metadata can also contain the address of the smart contract when it gets deployed.

metadata contains the address, and the size of the smart contract. The ABI Array is generated externally upon deploying the smart contract.

the ABI array and the Metadata are not generated when solidity is compiled to bytecode, its generated by a migration software which deploys the smart contract on the blockchain.

Address.call() is used for calling other contracts using the scope of the called contract in terms of storage variables. Address.delegatecall() is used for libraries, which uses the storage variables of the contract who called. Libraries are a great way to re-use already existing code and delegatecall can make sure that no storage is used from the library, instead it looks like the code is directly copied into the calling contract.

Address.delegatecall() is used for calling other contracts using the scope of the called contract in terms of storage variables. Address.call() is used for libraries, which uses the storage variables of the contract who called. Libraries are a great way to re-use already existing code and call() can make sure that no storage is used from the library, instead it looks like the code is directly copied into the calling contract.

PoW is computationally intensive which requires lots of energy. On the other hand, miners earn straightforward a reward for mining a block and incorporating transactions.

PoW is better than PoS, because with PoS we increase the amount of energy spent on the network.

PoS is mining with specialized new hardware that has to be purchased with a stack of Ether in the network. Hence the Name: Proof of Stake, which derives from Stack.

are always living on the same address, because the blockchain is deterministic. So, one account can always have one smart contract.

are having the same address as the EOA.

are sitting on their own address. The Address is created from the nonce and the EOA address and could be known in advance before deploying the smart contract.

the address of the smart contract is a random address which gets generated by the miner who mines the contract-creation transaction.

a function marked as pure can change the state, while a view function can only return static calls.

a function marked as view can never access state variables, while pure functions are here to return only one value.

a view function can access state variables, but not write to them. A Pure function cannot modify or read from state.

Integer, Boolean, Struct, Mapping and Enum.

Integer, Boolean, Enum and Addresses.

Integer, Boolean, Structs and Fixed Point Numbers.

Programs implementing the Ethereum Protocol to talk to each other and JSON-RPC interfaces to talk to the outside world.

A Java-Script library to compile and run Solidity Code.

A Framework for deploying and running smart contract in a decentralized way.