If you have an account on Poloniex.com or Bittrex.com (and other crypto exchange sites) you can use their API with TabTrader to easily trade and monitor prices on your phone. It's important to me that the app connects to Poloniex and Bittrex because these exchanges have good volume. And they're pretty credible. TabTrader supports other major exchanges too :)
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.
For instance, you might have a day trading strategy that exploits differentials in tightly correlated cryptocurrencies: BTC and ETH, for example. If you think that BTC and ETH are tightly correlated and you see that ETH is disproportionately low, you might buy ETH with the expectation that ETH will rise up again to restore its typical relationship with BTC. However, this might be a case of contagion: the whole market is going down. In this case, your technical analysis could be your downfall: you’ve just bought into a position that’s still going down.
As you decide to become a member of this platform, perhaps now, you will receive many incredible benefits. Our guide will include answers to all of the most basic and advanced questions. Strategies on how to better choose which altcoins to put your money into. As well as buy signals and detailed trading ideas for all those that already have the basic knowledge.
You could try this instead: Be sure to watch an exchange’s order book to better understand the actual prices you can get for the amount of cryptocurrency you’re trading. Consider breaking your order into smaller pieces to get a better price, or use a trading algorithm that lets you execute your larger order as a stealth order at the top of the order book.
Especially for traders dealing with fairly large amounts, multiple, small entries and exits over a fixed period of time (dollar-cost averaging) can help obtain a good price for an asset over an extended period of time. Consider using time-weighted average price trading: specify n, t, and p such that you buy or sell n of a cryptocurrency over t hours for an average price of p.
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.

Only invest what you can lose. During the recent crash in January 2018, hobby-investors got burned. Reports of frustration and losses came at the cost of broken monitors, smashed laptops, and heavy monetary losses. While the rules are in more particular order of importance, it’s safe to assume that this is the most important rule, the rule to rule the rules. As soon as your money is converted into cryptocurrency, consider it lost forever. There is absolutely no guarantee you can get it back. Losses don’t simply come from dips in the market; extraordinary factors such as hacks, bugs, and government regulation can mean you’ll never see any of your money again. If you are investing money you can’t afford to lose, you need to take a step back and re-evaluate your current financial situation, because what you’re about to do is an act of desperation. This includes: using credit cards, taking out mortgages, applying for loans, or selling everything and traveling the world (as glamorous as that sounds).