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. 
Why is it strongly recommended to invest only the amount you can afford? There is a psychological reason for that. When you use your own money that you can lose, you will not be vulnerable to different types of emotions that can ruin your deposit. Fears of losing all money that you have borrowed from the bank or friends will affect negatively your trading results.

Dad Advice: Don’t invest more than you can afford to lose. No really, there will be many great investments in your lifetime, there has been in Bitcoins lifetime. Bitcoin doesn’t cost $225 anymore. The chances that you’ll never have to work again if you invest your life savings in Bitcoin aren’t non-existent, but they aren’t as good as they used to be. If Bitcoin ends up down, you’ll be hodling the bag while others are on to better and brighter pastures.
Risk Warning: Trading forex, cryptocurrencies, indices, and commodities are potentially high risk and may not be suitable for all investors. The high level of leverage can work both for and against traders. Before any investment in forex, cryptocurrencies, indices, and commodities you need to carefully consider your targets, previous experience, and risk level. Trading may result in the loss of your money, therefore, you should not invest capital that you cannot afford to lose.
Trading strategies have been practiced since the first human civilizations formed. This means that even though we have converted them to our current trading market, the basis of everything is still bartered trade. What are we trying to say here? We’re trying to say that no matter what the strategy is; the main point of following one is to make a profit.
Cex.io provides a wide range of services for using bitcoin and other cryptocurrencies. The platform lets users easily trade fiat money with cryptocurrencies and conversely cryptocurrencies for fiat money. For those looking to trade bitcoins professionally, the platform offers personalized and user-friendly trading dashboards and margin trading. Alternatively, CEX also offers a brokerage service which provides novice traders an extremely simple way to buy bitcoin at prices that are more or less in line with the market rate. The Cex.io website is secure and intuitive and cryptocurrencies can be stored in safe cold storage. Check out the Cex.io FAQ
(BTW, don’t you love the price predictions on Bitcoin that pundits come up with from time to time? Talk about a wide price and time spread. And they are always disclaimed with something like “these predictions should be taken with a grain of salt” and “do your own research” and “this is no way constitutes investment advice”. Imagine if there was a “sell side analyst” job in crypto. Talk about a great gig…)
Knowing generally how people are behaving, how they are feeling about the coin’s activity, and the news flow (i.e. government, or big business factual news about the space) surrounding the upturn or downturn that will push it one way or the other is the key to this strategy for the trading of cryptocurrency.  One can’t really tell exactly but using the right clues we can make smart decisions based on the preponderance of the evidence.

Leverage is money that a broker loans you. Unless you’re a professional trader, you should stay away from leverage until you’ve learned everything you can learn about making trades with your own money. While leverage can help you make greater profits with short cryptocurrency movements, it can also amplify your losses when the trade takes a wrong turn.
This is not a get rich quick scheme. While returns can be good at times, I have seen periods of stagnation, five +30% market dips and a bear market. Whenever you enter the market, it could be on the rise, in a drop or be stagnating. I have also had days and weeks where I have seen a significant decline in my portfolio. I can't predict what the market will do when you enter. Please invest for the long term. This is much more volatile and risky than the stock market.
EDIT: #10 Bonus (Suggested by @kerstenwirth ) — always check the ticker symbol. Ticker symbols are not universal, and may vary from exchange to exchange in rare cases. Those cases, though, can come back to bite you. For example, Bitcoin Cash trades on some exchanges as BCH, while it trades on others as BCC. BCC is also the ticker symbol for BitConnect, which was recently outted as a Ponzi Scheme. If you bought BCC under the impression was Bitcoin Cash, you would’ve lost a lot of money.
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