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There are scheduled news releases that come out daily, and certain news releases like Non Farm Payrolls and rate decisions have a massive affect on the markets. It is important to know when these news releases are due, and before the start of each month you should make a note of the important ones. I have a up-to-date economic calendar on this site which you can access here.
The problem is that this is where traders are most likely to succumb to overconfidence bias. It's not uncommon for traders to complete a winning streak and then believe that they can't get anything wrong in the future. To believe this is of course unwise, and is only going to end in failure. Make sure you always analyse your trading sessions and look at your wins and losses in detail.