This will depend on how much of a Bitcoin you intend to buy. Depending on the time of your purchase, one Bitcoin can cost tens of thousands of dollars. Many traders opt to purchase a fraction of a Bitcoin, such as one-third or half of a coin. This will depend on the time you purchase Bitcoin and the amount you want to purchase. Like all markets, the price of Bitcoin fluctuates.
The smallest unit of Bitcoin is a Satoshi, which is equal to one hundred millionth of a Bitcoin. Similar to $1 in fiat currencies may be divided into smaller units like 50 cents, 20 cents, 10 cents, etc.
Satoshi Nakamoto understood that for a currency to function as a medium of exchange, it must be simple to divide into smaller amounts that can be used to pay for all products and services in an economy.