0x0000000000000000000000000000000000000000) and anyone can take the order, or private, where the taker is a specific user's account. Private orders can only be fulfilled by a specific account - no other account is allowed by the smart contract.
takeron the order object. Buy orders with the null address as their takers are offers. Buy orders with an address other than the null address as their takers are bids.
created_dateis the date the order was made.
listing_timeis the timestamp that the order will start to be fulfillable. For most orders this is right when they're made, but for English Auctions it's when the user wants the auction to end (this is added security to make sure it's not matchable until then).
expiration_timeis the timestamp that the order will no longer be fulfillable ever. For most orders this is when the user wants them to expire, but for English Auctions it's set to a point later in the future, just so that MaNEKO NFT servers have enough time to match them with the highest bid.