News can be broadly classified into two categories:
Periodic or Recurring: This includes the scheduled releases of news that moves the markets, including interest rate announcements by the Federal Reserve, economic data releases, and quarterly earnings reports from companies.
Unexpected or One-Time: These are bolts from the blue such as a terrorist attack, a sudden geopolitical flare-up, or the threat of debt default by an indebted nation. As a rule of thumb, unexpected news is more likely to be bad than good.
https://www.investopedia.com/articles/active-trading/111313/how-trade-news.asp