My own TOP5 mistakes to avoid.
Do not trade without:
1. Financial management
2. The ability to see and understand the trend.
3. Technical analysis and using such indicators as Moving average, Fibonacci, Bollingar Band etc.
4. Understanding of fundamental news and their impact and how to use and make them work for us.
5. Сlear mind
Trends are usually pretty visible, in my opinion. Missing a trend reversal, however, can be a pretty major mistake.