For interaction and transacting with smart contracts you need to pay gas fee. Here are some tips for saving gas in Solidity.Using constant and immutable variables. For variables, that won’t be ever changed you can use constant or immutable keyword. Constant variables must be fixed at compile-time, immutable variables can be assigned at construction time. Using these keywords not only saves gas (because such variables don’t occupy storage slot), but also improves readability of code.In Solidit...