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Before you can receive Bitcoins in any way, you need a digital wallet to keep them in. You can think of a Bitcoin wallet as similar to your physical wallet where you keep your cash, credit, and debit cards, although of course, you don't need a physical wallet to accept other forms of money. You can choose from mobile, software, or hardware wallets. Go to https://bitcoin.org/en/getting-started to choose the best wallet for your needs.  Although online wallets are available, these typically aren't the best option because they are extremely vulnerable to hackers and you don't actually control them. Mobile wallets are free apps that you download from your smartphone's app store. A software wallet, on the other hand, is a desktop application that you download from the website of the wallet's creator. These wallets are as secure as your computer or smartphone and the network you're on. Hardware wallets look a bit like a thumb drive and can be purchased online or at computer stores for around $100. While they do require a bit of investment compared to the free mobile and software wallets, they keep your Bitcoin more secure because they are not connected to the internet. Use a hardware wallet if you plan on getting a lot of Bitcoin and want to hold it long-term. Once you set up your wallet account, it will provide you with a Bitcoin address. You can think of this address as similar to a bank account. If you want to receive Bitcoin, you'll have to supply the sender of that Bitcoin with your Bitcoin address. You don't need to keep your Bitcoin address a secret. Anyone can send you Bitcoin using the address, but they can't take any Bitcoin from your wallet (or even see how much you have). You need your private keys to manage the Bitcoin you own. If you already know someone who is interested in giving (or selling) you some Bitcoin, all you have to do is give them your wallet's Bitcoin address. If you don't yet know anyone but are interested in an in-person exchange, there are peer-to-peer (P2P) websites that can help you find a seller.  For example, LocalBitcoins is a site that helps match buyers and sellers of Bitcoins who live near each other and want to complete an in-person exchange. You shouldn't ever need to meet someone physically in person to conduct a Bitcoin exchange. These transactions can be completed entirely online. Bitcoin ATMs enable you to buy small amounts of Bitcoin without going through a third-party exchange or finding another individual who has Bitcoins they're willing to sell to you. However, using a Bitcoin ATM largely depends on whether you live in an area where these ATMs are available. Visit https://coinatmradar.com/ to locate Bitcoin ATMs near you. If you own a small business, you can sign up with a merchant services program to accept Bitcoin as payment. These programs are particularly popular with online businesses and most shopping cart services allow you to enable Bitcoin as a payment option.  Even if you own a brick-and-mortar business, you can also accept Bitcoin if you use a tablet or mobile phone to allow customers to pay with their mobile phones. Since Bitcoin transactions are irreversible, if you accept Bitcoin for payment you can avoid chargebacks as a result of a customer complaint or dispute.

Summary:
Set up a cryptocurrency wallet that you control. Copy your wallet's Bitcoin address. Connect with someone who wants to sell their Bitcoin. Buy Bitcoin through a Bitcoin ATM. Accept Bitcoin as payment for goods or services.