I think long-term for people dont have so much time for daily trading. we can't update every information on internet so it is very hard to track every altcoin you invest. so pick up some good coin and wait is a better strategy for this moment
I think that long-term investment is completely wrong, you can see that the market is constantly fluctuating and difficult to guess, bitcoin prices are constantly adjusting and fluctuations are very strong, so to be able to To make a profit safely, I believe you should only invest in short bitcoin. The market will continue to fall sharply in 2018 and so long-term investment will continue to fail.