Recently, many people have asked me what digital currencies are. Honestly, this is definitely a topic worth discussing in depth.

The concept of digital currency has actually existed for a long time. From the earliest electronic money and virtual currencies, to today’s cryptocurrencies, the legal frameworks in different countries have been continuously evolving. Simply put, a digital currency is an asset that exists in digital form and can be used to store value or as a medium of exchange.

But what investors really care about is decentralized digital crypto—new types of money generated by computer programs based on cryptography and P2P technology, and circulated over the internet. Today, there are more than 20,000 cryptocurrencies in circulation worldwide, with daily trading volume exceeding one hundred billion dollars, and global users numbering over 300 million. These numbers show that the crypto market is no longer a niche topic.

By market capitalization, digital currencies can roughly be divided into three categories. Large-cap coins carry relatively lower risk, have deep liquidity, and are best suited for beginners; mid-cap tokens have greater volatility but stronger growth potential; small-cap tokens lack liquidity and are prone to rapid surges and crashes, making their risk extremely high. That said, honestly, every digital currency involves risk. A high market cap doesn’t necessarily mean absolute safety—the key is the timing of your entry and your trading strategy.

As for which digital currencies are worth investing in, my advice is that beginners should prioritize large-cap coins. Bitcoin (BTC) is currently priced at $77.17K, with a market cap of $1.55T. As the “gold standard” of cryptocurrencies, it has the lowest knowledge barrier, the best liquidity, is supported by nearly all exchanges, and has already been included on the balance sheets of multiple large companies. It is based on the PoW consensus mechanism and a decentralized node network, making it highly secure, and it’s often used as a hedge asset.

Ethereum (ETH) is currently priced at $2.12K, with a market cap of $256.24B, ranking second. Most DeFi, NFT, and blockchain gaming projects are built on Ethereum, and it has strong ecosystem support. After switching to PoS, scalability improves and energy consumption decreases, and its long-term potential is widely seen as promising.

Ripple (XRP) is currently priced at $1.36, with a market cap of $84.27B. It focuses on cross-border payments for financial institutions and can complete low-cost international remittances in 3–5 seconds, having been adopted by some banks. However, it’s important to note that XRP has a relatively high degree of centralization, with sharp price fluctuations—so only small allocations are recommended.

There’s also Binance Coin (BNB), currently priced at $643, with a market cap of $86.67B. It’s not just an investment asset—it’s a pass for a large exchange ecosystem. Using BNB to pay trading fees can also come with discounts. That exchange repurchases and burns BNB using profits every quarter, and in the long run this may help push prices higher. Its volatility is relatively lower, making it a great fit for beginners looking for steady investment.

Stablecoins such as USDT and USDC are also worth paying attention to. USDT is currently priced at $1.00 with a market cap of $189.86B, and USDC is priced at $1.00 with a market cap of $76.64B. They are pegged 1:1 to the US dollar, with no volatility. This makes them very suitable for beginners to practice trading operations, learn how to transfer funds, or quickly hedge during bear markets.

There are several ways to invest in digital currencies. The most common is buying through a major exchange. After registering and completing identity verification, you can deposit TWD or USD. You can also use decentralized exchanges such as Uniswap—where you trade wallet-to-wallet—but you must take on the smart contract risk yourself. Another option is a contract for difference, which doesn’t require you to actually hold coins. As long as you predict price movements up or down, you can profit, and you can also use leverage. Many platforms use a zero-commission model, charging only the spread, which is more friendly for people with smaller amounts of capital. There are also options such as crypto ETFs, trust products, and mining, but each has its own pros and cons.

Digital currencies do have many advantages. First, the issuance and trading rules are written into the system in the form of code from the beginning and cannot be changed, which fundamentally prevents over-issuance and abuse. Second, by using the blockchain consensus mechanism, every transaction must be collectively confirmed by all participants, ensuring transaction security and transparency with the lowest possible cost. Digital currencies are also bidirectionally transferable—you can freely transfer them among users, and transaction costs are far lower than those of traditional financial institutions. Central bank digital currencies could even allow governments to pay citizens directly, simplifying production and distribution methods.

But we also need to see the problems. Because the total supply of digital currencies is fixed, they have a natural tendency toward deflation, which does not help economic development. Price volatility is high, and without a stable benchmark for measuring value, any unexpected factor can trigger price changes, increasing the risk of losses for investors. Another issue is storage security—if you forget your digital wallet password and lose the data, it cannot be recovered at all, which is a disastrous blow for users.

In summary, digital currencies are changing the global financial landscape, making financial access easier, faster, and more affordable. Many countries are planning their own digital currencies, which shows that the crypto market is gaining wider recognition. In the future, digital currencies are likely to continue attracting new users, and the technology will keep evolving and innovating. If you want to start investing in digital currencies, remember to prioritize large-cap coins, avoid small-cap “shanzhai” coins and projects without a whitepaper, and choose compliant trading platforms—this is how you can participate in this market with relatively more peace of mind.