<p>Short and long in cryptocurrency terms generally relates to Bitcoin too.</p><p>Long means buying when the price has dipped then selling when there is an increase in price. It is just the normal buy the dip idea. You should be careful when buying at low price, because a low price that you think it is for a coin might actually be the highest price. So, make your research well.</p><p>The other one short means lending bitcoin or other coins when the price is high then pay back when the price is low. Bitcoin was over $7,300 some days ago, imagine you lend at that rate and sold immediately. Now the price is down and around $6,500 now. You then buy at this price and return to the lender. You have made a gain based on the low price. This is shorting. Although there are many more things involved in shorting. This is the basic that you should know.</p>