The top of the order book will show you the lowest price at which someone is willing to sell a cryptocurrency, and the highest price at which someone is willing to buy it — but that doesn’t mean you can buy or sell the amount you want at that price. In fact, the amounts of a cryptocurrency that people are offering to buy or sell at the top of the order book are often quite small, which means that, if you’re trying to buy or sell a larger amount, you’ll have to go deeper into the order book: finding a counterparty who’s offering a price that isn’t as good as the “market price.”

You could try this instead: Buy and sell on multiple exchanges; then, when you see those moments of indecision in the market, buy more of the cryptocurrency on the exchange with the lowest price, while simultaneously selling some on the exchange with the highest price. That way, your risk is mitigated: if the price rises, you’ve made money, and if it drops, you can buy back in at the lower price.
Once you have narrowed down on cryptos with high daily trading volumes, focus on their historical price movements. The best way to do this is to use a financial ratio known as the Sharpe ratio.  Don’t worry about calculating it, since you can easily find it online.  The Sharpe ratio measures the potential return of an asset based on its volatility.  Figures higher than 1 are usually a sign of an asset with high potential returns. Given that cryptos had a stellar year in 2017, most of them have a Sharpe ratio of higher than 1.  Therefore, for you to make use of this ratio, narrow down on cryptos that have the highest Sharpe ratio relative to the rest of the market to Profitable Cryptocurrency Trading
Bitcoin is different than any currency you’ve used before, so it’s very important to understand some key points. You can use them to send or receive any amount of money, with anyone, anywhere in the world, at very low cost. Bitcoin payments are impossible to block, and bitcoin wallets can’t be frozen. Actually, the Bitcoin network is unstoppable and un-censorable.
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I prefer to trade on decentralized exchanges. For myself, I made a choice in the form of ethnermium.сom. They have a huge number of coins. There are no minimum restrictions on trade and fees are so insignificant that you will not notice them. I also think the advantage of the easy creation of a wallet like MeW and easy integration with metamasks and a high level of security

Notice the small bull run. Now imagine we had decided to buy Ethereum somewhere around that dotted line and just before 8pm. We saw it tick up after a string of bearish candles, and for whatever reason, thought it might continue it’s way upward. To minimize our losses (remember our goal is minimize losses and maximize gains), we set a stop order right away. We’ll set it near the bottom of those last couple bearish candles (about $474). Now as we watched the price work it’s way up, we would continue to raise our stop price. To do this, we would go to our open orders (every exchange will show this), and click cancel on the stop limit that we had just set. Shortly after 8pm, we might’ve had a stop at $480 that would’ve been triggered. If you’re stop limit is triggered and the signs point to the trend continuing you’re able to buy back in with a profit already in your pocket.

For example, if it was thought that things were getting very frothy, and most of the people who were getting in were just gamblers who were buying on credit, then that might be the time to cut loose using that as your signal rather than using a technical one.  On the other side, if you have cryptocurrency that is just hammered to the floor with everyone thinking it’s dead and everyone’s out of it, one can use this opportunity to make a few purchases as a long-term investment and wait for the upturn.
Now that you have identified the coins to invest in, you need to find an entry point for your investment.  Technical analysis has always been the best strategy for finding an entry point when investing in financial assets. The best way to use technical analysis in finding an entry point is to understand candle stick patterns. For instance, if you are looking to buy Bitcoin, then a bullish engulfing candle stick pattern on the weekly chart would be a good indicator that it is time to enter the market.
Investing and especially trading, is a highly skilled task. You need the best equipment, execution and tools. When the market is only going up any fool can make money but that blessed state never lasts long and what is left is an environment requiring focus, skill and discipline. To succeed unlike the devastated cohorts of dotcom and the real estate bubble, you have to work hard at it.
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.