Cryptocurrencies are digital or virtual tokens that use cryptography to secure their transactions and control the creation of new units. And cryptocurrencies are often bought with "fiat" or traditional currency like US dollars or euros. However, they can also be bought with cryptocurrencies like Bitcoin or Ethereum. First, you must set up a digital wallet to store your coins to buy cryptocurrency. You can then buy coins on a cryptocurrency exchange using your fiat currency or another cryptocurrency.

There are a few different ways to buy cryptocurrency.

• You can use an online cryptocurrency exchange such as Coinbase, Bitstamp, or Kraken to purchase cryptocurrency with a credit/debit card, bank transfer, or other payment methods.
• You can use a peer-to-peer exchange such as LocalBitcoins or Bisq to purchase cryptocurrency directly from other users.
• You can trade cryptocurrency for other types of assets, such as stocks, through cryptocurrency trading platforms.

How to Store Cryptocurrency?

Storing cryptocurrency securely is an integral part of investing in cryptocurrencies. Cryptocurrency can be stored in several ways, but the most common is through a digital wallet. A digital wallet can be software-based, web-based, or hardware-based. 

• Software-based wallets are installed on a computer or mobile device, while web-based wallets are accessed through a web browser. 
• Hardware-based wallets are physical devices that store cryptocurrency offline.

Digital wallets are used to store, send, and receive cryptocurrency. They are generally more secure than other wallets and not subject to hacking or malware. However, digital wallets can be recovered or stolen if adequately protected.

It is also essential to use strong passwords and two-factor authentication to protect the wallet. Additionally, using an address generated through a secure random number generator can help protect against address reuse and other security risks. And it would be best to keep your private key private, which can access your cryptocurrency.