What affects the market is people's buying and selling of Bitcoin. You may trust the suggestions of some well-known people. Some news will also be relevant to the market trend of Bitcoin.
Yes I think the influence or what affects the market is the number of transaction going on in the market and the direction that it is going. If there are too much order for sell for instance, it can trigger fud for bear and that panic can get more deep bears coming in because nobody want to lose their money and they want to also sell. Further to the other hand if there is a whale order for buy too that may bring the waves of bull in the market. Or a news can trigger price to any direction.