Taking the first option listed above, which is to buy the underlying, you become the direct holder of the digital asset. Upon purchase, the cryptocurrency is sent to your bitcoin address or account (wallet) with the exchange. From there, you can transfer the crypotocurrency to any bitcoin address or wallet address using your private key that verifies you control ownership of the asset.
I bought Elastic $XEL at the obscure Heat exchange. It was rather difficult discovering how to buy it because I was in this case ahead of the herd where the path was not well defined. In the end I bought it at a high price (average 31,367 Satoshis, should have got them at 25,000 Sats) as I got scammed over at Heat by a predator (Arsonic @Ars0nic on Twitter) playing the order book. We’ll see how that plays out. I think the excessive price I paid will not matter too much.

From a trader’s perspective Smith also discussed key BTC prices, namely the $5,800 support level and the $6,800 resistance level, noting that the recent lows of bitcoin are practically the same ones that were touched in April and February, earlier this year. Curiously, these were the same points BTC was trading at last October when bitcoin futures were announced and the price of the world’s most popular virtual currency skyrocketed.

Is it possible to place a ‘take profit’ and a ‘stop loss’ command simultaneously? As of the time of writing, excluding some leveraged trading exchanges, such as Bitmex, current trading exchanges do not support the placement of the two commands simultaneously. In a perfect world, we could have set both stop loss for trade and levels of profit taking, lowering the chance of substantially loss. Until that happens, we will settle for what we have – I usually set take profit levels for some part of the position, while setting a stop loss level for the other ones.

Now I have my strategy that I stick to without letting my emotions interfere. I have a set of coins that I like trading so I only look at those charts. I have patterns and indicators that I look for on those charts so I can quickly flip through them. Within minutes I can set my orders, set alerts on my desired entry and exit prices, and walk away from the computer.
It does not matter at what point you enter the market for a coin if you believe in the long-term. Bitcoin was once expensive at $1; it was then expensive at $10; people could not believe it when it hit $100; people could not believe it when it hit $1,000 and when it hit $10,000 they called it a bubble. It could be $25,000 next year or drop back below $5,000. My only advice here is not to chase something during a parabolic upwards move because it will almost certainly come back down. 
Know what you are investing in, and know the risk. Bitcoin is speculative and volatile. Buying near $Xk means buying near the highest price Bitcoin has ever been. Some think Bitcoin is going to $X2k; some think it is going to $10. It is easy to get euphoric and think whatever today’s price is a safe bet. Historically that has been true or not depending on the weather on a given day.
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.