While Bitcoin is currently the most well-known and widely used cryptocurrency, there are many other cryptocurrencies in existence, each with its own unique features and potential for growth. Some of these alternative cryptocurrencies, or "altcoins," include Ethereum, Ripple, and Litecoin, among others.

In terms of long-term planning, it may be wise to diversify one's investment portfolio to include a variety of cryptocurrencies and other assets, rather than relying solely on one cryptocurrency. It is important to carefully research and evaluate each cryptocurrency before investing, as the cryptocurrency market can be volatile and unpredictable.

So, whether or not to invest in cryptocurrency and which specific cryptocurrencies to invest in is a decision that should be carefully considered and made based on individual financial goals, risk tolerance, and personal preferences.