There are many ways that can be used to build the hype on a coin. Be skeptical of everything you read online. There are many fake twitter accounts, fake reddit accounts, and fake blogs, and even sponsored news articles to make it seem like a cryptocurrency seems to have spikes, but in reality the spike is being orchestrated by only a few people who want to make a quick profit. Just like the stock market, you can make short-term profits from several things, but this is not a guarantee for long-term growth. Be skeptical and do your own research.