One of the most popular ways of buying and selling Bitcoin is through cryptocurrency exchanges. Cryptocurrency exchanges are online platforms where users can buy, sell, and trade Bitcoin and other cryptocurrencies. These exchanges allow users to buy and sell Bitcoin with fiat currencies like the US dollar, or with other cryptocurrencies like Ethereum. They also offer a wide variety of trading tools and features, such as margin trading and limit orders.

Another popular way to buy and sell Bitcoin is through peer-to-peer marketplaces. These marketplaces allow users to buy and sell Bitcoin directly from each other without going through a middleman. This can be done using cash, debit cards, or other payment methods. The advantage of using a peer-to-peer marketplace is that it allows users to avoid the high fees associated with cryptocurrency exchanges.

Finally, some people prefer to buy and sell Bitcoin through online brokerages. Online brokerages are similar to cryptocurrency exchanges in that they allow users to buy and sell Bitcoin with fiat currencies. However, they typically offer lower fees than exchanges and offer more features, such as the ability to set stop-loss orders and limit orders.

Overall, the most popular ways of buying and selling Bitcoin are through cryptocurrency exchanges, peer-to-peer marketplaces, and online brokerages. Each of these methods has its own advantages and disadvantages, so it is important to research each option and determine which is the best fit for you.