There are a few different exchanges that you can use to purchase Ethereum. The most popular exchange is Coinbase, which allows you to buy Ethereum with a credit or debit card.
Another popular option is Kraken, which allows you to trade Ethereum for other cryptocurrencies or fiat currencies.
If you’re looking to store your Ethereum long-term, you should consider using a hardware wallet like the Ledger Nano S. This will allow you to keep your Ethereum offline and secure.
No matter which option you choose, make sure that you do your research and only use reputable exchanges and wallets.