yes, it is possible to buy Bitcoin in parts. Many people decide to buy Bitcoin for US dollars through Coinbase or GDAX. However, the network is slow and with the sky high fees, you wont’t get much. But if your goal is to just dip your toe in the market and play around - why not.

Now, if you want to get other currencies afterwards, you’ll probably want to move over from Coinbase since they only offer Bitcoin, Litecoin and Ethereum, and don’t necessarily give you the best rate. Good rule of thumb is to always look around and see where you can get the best deal. There are services that do that for free.