Cardano (ADA) is a fully open-source, decentralized, public blockchain and cryptocurrency. Cardano is very similar to Ethereum, and the team wants to build on that. Cardano aims to operate a global smart-contract platform which will deliver much more advanced features compared to its competitors. Loads of existing investors are excited because Cardano is the first blockchain founded on scientific philosophy, and also the very first provably secure proof of stake algorithm.
When buying coins, and especially with Bitcoin, you will notice that your purchase is in decimal. A Bitcoin itself is relatively expensive, around $10,000 at the moment (as of 15th Feb '18). If you were to purchase say $5,000 of Bitcoin, you would at today's rate be purchasing around 0.5 of Bitcoin. Do not ever worry about this; Bitcoin operates at eight decimals places. You do not need to own a whole Bitcoin or any coin for that matter. Consider it like pence in the pound or cents in the dollar, but with more decimal places.
A “manageable amount” is obviously subjective and will vary for each person based on things such as time available to dedicate to trading. Feel free to do your own research to find the right exchange for you. I tend to value user experience of an exchange over the amount of coins on it. Ultimately, what exchanges you use is going to depend on your own personal preferences. GDAX and Poloniex will provide sufficient resources needed to be a successful trader, so they are definitely a good place to start.
On top of the possibility of complicated reporting procedures, new regulations can also impact your tax obligations. The U.S, the ‘property’ ruling means your earnings will now be deemed as capital gains tax (15%), instead of normal income tax (up to 25%). Each countries cryptocurrency tax requirements are different, and many will change as they adapt to the evolving market. Before you start trading, do your homework and find out what type of tax you’ll pay and how much.
Never put all your eggs in one basket. Diversify. While the potential to earn more is increased with the amount of money you invest into a coin, the potential to lose more is also magnified. Another way to think about it is to look at the cryptocurrency market as a whole; if you believe that this is just the beginning, then more than likely the entire market cap of cryptocurrencies will increase. What are the chances that this market cap increase will be entirely driven by one coin vs. being driven by many coins? The best way to safely capture the overall growth of cryptocurrency is to diversify and reap the benefits of growth from multiple coins. Also, fun fact — Between January 2016 and January 2018, Corgicoin has increased by 60,000x, and Verge has increased by 13,000x. During the same period, Bitcoin has increased by 34x. While you would have gotten impressive gains from Bitcoin, expanding into other coins could have landed you potentially larger ones.