There are a number of tools you can use to maximize profits and minimize risks, such as margin trading, leverage, and stop-loss orders. Shorting Bitcoin and other cryptocurrencies can be done in a variety of ways. Just looking at the Bitcoin price chart for early 2018, you can see that those that spotted the downward trend in mid January and made a short trade would have made 40% profits by exiting one month later.
I am not your guru. I’m a crypto enthusiast, not a professional trader, and I make plenty of mistakes. There are a huge amount of ‘gurus’ and ‘experts’ out there but the truth is that many of them haven’t got a fucking clue what they are talking about. Opinions in cryptocurrency are like assholes, everybody’s got one. It’s extremely easy to predict the market and hell, everybody seems like an expert, when cryptocurrency is experiencing a bull run.
It’s important to realise that you need to do your own research and come up with your own strategy for cryptocurrency trading. If you are short on time and want to play it safe; the easiest cause of action is to simply diversify into several different coins and then wait a year or more. However, if you want to maximise profits you should learn how to swing trade cryptocurrency.

Use small buy-ins, and don’t margin trade or short unless you know your stuff. The smaller your bet is compared to your total investable funds, the less risk you are taking on every bet (one of many insanely important things we are covering here). Putting it all on black is tempting, but then if it comes up red, you have nothing left to invest. Live to fight another day by learning to manage your buy-in size. As a rule of thumb invest 1% or less per buy-in (yes, that small, really; losing 100% of 1% leaves you with 99%, losing 1% of 100% leaves you with 99%. Small bids offer the same bet, but with way less risk). Put reward aside and practice risk management and capital preservation until you are very experienced (and thus, by logical extension: don’t margin trade or short unless you know what you are doing, as those leveraged bets magnify your risk by their very nature). See Kelly criterion.

That bold green candle yells at you “you are the only one not holding me”. At exactly this point you will notice lame people flooding the Crypto forums and the exchanges’ Troll boxes to talk about this pump. But what do we do now? Very simple, Keep moving forward. True, it’s possible that many may have caught the rise ahead of us and it can continue raising, but bare in mind that the whales (as mentioned above) are just waiting for small buyers on the way up to sell them the coins they bought in cheaper prices. Prices are now high and it’s clear that the current coin holders only consist of those little fish. Needless to say, the next step is usually the bright red candle which sells through the whole order book.

When you buy/sell via an exchange, try to use limit orders (try not to use market orders). On some exchanges, like GDAX, limit orders have lower fees than market orders. On GDAX, limit orders are free as long as they don’t fill immediately. Meanwhile, market orders result in a .3% fee, which is better than the 1.4% that Coinbase charges but not as good as 0%, especially if you are day trading. If your exchange rewards you for using certain order types, aim to use them.
I’ve met so many people that are speculating in crypto these days that have never even read Satoshi’s white paper on Bitcoin. Not only are they not practitioners (tech experts), they even are too lazy or too blinded by greed to even do a baseline level of work. There are many easy ways to quickly get up to speed on crypto and educate oneself you just have to do the work (one of my go-to resources is a company called Oddup which is an ICO/Crypto rating company used by all the major crypto hedge funds and institutional players).
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.