By calling this function you'll specify the mTokens that you wish to "enter" the market for. This marks your supplied position in a market to be used for collateral calculations, and is a pre-requirement for borrowing assets from the protocol.
Does the opposite of "Enter Market" - marks a supplied position as no longer to be used for collateral calculations. Can not occur while actively borrowing against this market and cannot succeed if doing so will plunge your position underwater.
Sets the amount of gas sent with any native token sends from the protocol, useful to support things like Gnosis Safe, but should be set to the minimum threshold necessary to hedge against reentrancy issues.