What is the default txid for Bitcoin Core?

In the realm of cryptocurrency and finance, a crucial element to understand for any Bitcoin enthusiast is the transaction identifier, commonly known as txid. So, for those just getting into the Bitcoin Core world, it begs the question: What is the default txid for Bitcoin Core? Is there a standard or predefined identifier that is set by default when a transaction is initiated through the core protocol? Does the core software assign a unique identifier automatically, or does it rely on external factors to generate this crucial piece of information? Understanding the answer to this question is crucial for anyone wanting to delve deeper into the intricacies of Bitcoin transactions and how they are tracked and verified within the blockchain.