Homepage of solidity : https://solidity.readthedocs.io/en/develop/
Remix : http://remix.ethereum.org
Source code : https://github.com/willitscale/learning-solidity
If you would like to donate some Ethereum my wallet is: 0xC8c8c3Fae80e3eD236970e1C93AcF5B91D0993e2
Many thanks!
Solidity Documentation Gas : https://solidity.readthedocs.io/en/v0.4.24/introduction-to-smart-contracts.html#gas
ETH Gas Station : https://ethgasstation.info/
Solidity Source Code Gas : https://github.com/ethereum/solidity/blob/c42dfc5b1083a0d49c64a6e3cbe2d3f220d1f519/libevmasm/GasMeter.h
