- Panic Buy/Panic sell.
In both cases, you will lose your money - Ignore Capital management.
If you ignore Capital management you will be gambler not trader
- Following a signal Without risk assessment or stop loss.
You will be like Jumping into the ocean without a lifeline jacket at, before do anything, look at your risk and reward and what your stop level is.
by this way you can set Your Own risk and know what you do.
I strongly agree with the third point, many people (even I once) experienced mistakes by directly trusting the trading signals without careful thinking and without doing research first. So since then I have always tried my best to be careful in accepting recommendations from several trading signals.