How do you know the bitcoin trend of the day?

You ma have to follow the news, like any asset price traded.

In the blochain industry, China and the SEC are very important to read. Russia and South Korea are good source of information to have.... So be alert.... Also,do not jump too fast when there is a price change: could be a simple correction on the market or a small pump or dump...... Be alert and inform yourself..... 

Please Note: i'am not a registered investment advisor and this is not an offer for investment advice. You should do your own investigation and due dilligence to make a decision. You should seek the advice of a qualified securities professional before making any investment. All provided here is just my own opinion.