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P2P Exchanges: Unlike decentralized exchanges, which match up buyers and sellers anonymously and facilitate all aspects of the transaction, there are some peer-to-peer (P2P) exchange services which provide a more direct connection between users. Local Bitcoins is an example of such an exchange. After creating an account, users can post requests to buy or sell bitcoin, including information about payment methods and price. Users then browse through listings of buy and sell offers, choosing those trade partners with whom they wish to transact. Local Bitcoins facilitates some of the aspects of the trade. While P2P exchanges do not offer the same anonymity as decentralized exchanges, they allow users the opportunity to shop around for the best deal. Many of these exchanges also provide ratings systems so that users have a way to evaluate potential trade partners before transacting.
After you’ve set up your wallet with a payment method, you'll need a place to actually buy bitcoin. Users can buy bitcoin and other cryptocurrencies from online marketplaces called “exchanges,” similar to the platforms that traders use to buy stock. Exchanges connect you directly to the bitcoin marketplace, where you can exchange traditional currencies for bitcoin.
The public key is the location where transactions are deposited to and withdrawn from. This is also the key that appears on the blockchain ledger as a user’s digital signature, not unlike a username on a social media newsfeed. The private key is the password required to buy, sell, and trade the bitcoin in a wallet. A private key should be a guarded secret and only used to authorize bitcoin transmissions. Some users protect their private keys by encrypting a wallet with a strong password and, in some cases, by choosing the cold storage option; that is, storing the wallet offline.