In the early days of Bitcoin, specifically when it appeared in 2009 by "Satoshi Nakamoto", it had no specific financial value, as it was not traded on any platforms and was considered just a technical experiment.
However, the first attempt to evaluate it financially occurred in October 2009, when someone named "NewLibertyStandard" published a method to calculate the price of Bitcoin based on the cost of electricity to mine it.
The first known official valuation:
In October 2009, it was: 1,309 Bitcoins = 1 US Dollar, meaning: one Bitcoin ≈ 0.00076 dollars (less than a tenth of a cent)
The first known purchase transaction:
On May 22, 2010, a person named "Laszlo" bought 2 pizzas for 10,000 Bitcoins.
This order is considered the first real commercial transaction with Bitcoin, and this day has become known as "Bitcoin Pizza Day".
And if you had held onto 10,000 Bitcoins since then 😅, you would be a billionaire today.