LendingPoolCore contract holds the state of every reserve and all assets deposited, as well as the basic logic (e.g. calculations using the stored data).LendingPoolAddressesProvider is a global addresses register of the protocol. This contract is immutable and the address will never change. For more information, see the Address Provider section of the documentation.LendingPoolDataProvider contract performs calculations and provides data for the LendingPool contract, specifically:LendingPoolCore to provide high level information to the LendingPool.LendingPool contract uses both the LendingPoolCore and LendingPoolDataProvider to interact with the reserves. This is the main contract developers should interface with. See the LendingPool section of the documentation.LendingPool also manages the tokenization of users' lending position via aTokens.LendingPoolConfigurator contract provides configuration functions for the LendingPool and LendingPoolCore contracts. It also has a number of important functions:LendingPoolManager, as defined in the LendingPoolAddressProvider.InterestRateStrategy contract holds the information needed to calculate and update the interest rates of specific reserves.baseVariableBorrowRate,variableRateSlope1,variableRateSlope2,stableRateSlope1,stableRateSlope2.reserve has a specific InterestRateStrategy contract.aToken contracts are EIP-20 / ERC20 compatible interest bearing tokens, that represent users' lending positions. See the aTokens section of the documentation.