Event logs for ERC20 transfers.
Event logs for ERC721 transfers.
These are top level transactions that occur with a from address being an external (user created) address. External addresses have private keys and are accessed by users.
These are transfers that occur where the fromAddress is an internal (smart contract) address. (ex: a smart contract calling another smart contract or smart contract calling another external address). For a full deep dive into internal transfers check out this article on : https://docs.alchemy.com/docs/what-are-internal-transactions
Special NFT Transfers The special NFT endpoint allows users to query for NFTs that don't follow any ERC standards. The 2 included NFTs currently are CryptoPunks and CryptoKitties, which both predate current NFT standards.
These are event logs for ERC1155 transfers.