Perhaps the deadliest mistake a trader can make is letting emotion get the best of them. Those with the wrong mindset will lose in the long run; Whether it’s losing a trade and trying to get it all back by chasing a phantom opportunity that was never really there, or winning a huge trade just to get too greedy and giving it all right back. Set a clear goal each time you sit down to trade and walk away once you’ve hit your goal. Do the same for loses. Walk away and come back tomorrow. There will be opportunities will be there the next day, I promise.

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. 
One of the things to know here is that cryptocurrency exchange is not part of the regular stock exchange. They are not the same as Wall Street and its exchanges, although they share same general mechanics. The number of best platforms keeps growing as the market is still forming, here is a top 5 list of cryptocurrency exchanges ranked by trading volume.
Since all of the virtual currencies remain a speculative asset, investors should avoid buying them for their retirement portfolios, says Jason Spatafora, co-founder of and a Miami-based trader and investor. Cryptocurrencies made up less than 2 percent of his portfolio a few months ago, but he is no longer trading them because of the extreme volatility.
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).