All About Gas Use BitMaps https://soliditydeveloper.com/bitmaps https://hiddentao.com/archives/2018/12/10/using-bitmaps-for-efficient-solidity-smart-contracts References Gas cost of Solidity library functions Solidity - Simple Gas Savings Yamen Merhi - Gas Optimisations in Solidity Solidity Gas Optimisation Cheat Sheet https://www.alchemy.com/overviews/solidity-gas-optimization Mudit Gupta - Solidity Tips and Tricks to save gas Twitter posts on Gas https://twitter.com/maurelian_/status/1488691543544320000