Price manipulation is done by using many ways.Publishing speculative news in favour of boosting bullish trend is a way.Here on the below link,we could see that news sites continuously release news that bitcoin price is to boom.If we see such moves,we should be cautious about investing otherwise we may get fooled and we might have to regret for our wrong investment.Don't let news media to decide your fortune.
https://www.reddit.com/r/Bitcoin/comments/9dimq2/headlines_two_days_ago_this_is_how_market/The volatility in the bitcoin is very common and therefore its valuation is subject to flactuation and varies according to market demand and supply so being patience is very important to make good profit in bitcoin and there are very strategies for the price manipulation as it varies the number of investors and the amount of capital they are investing, higher the number of investors and higher the capital, higher will be the demand and higher will be the valuation and then holding is the next strategy for the price manipulation.