- 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.
Not Using Stop loss is also a big mistake. It is very risky to trade without stop loss.