What are interesting parts of the Bitcoin Core codebase?

This function is responsible for identifying and selecting what are presumed to be the best transactions from the mempool to include in the next block. The functionality encapsulates the intricate process of evaluating transactions based on predefined criteria to ensure that only the most suitable transactions are added to the forthcoming block, thus maintaining the integrity and efficiency of the blockchain network. Through this mechanism, the blockchain system ensures that transactions are processed in a manner that aligns with the network's operational protocols and standards, contributing to the overall stability and reliability of the blockchain.