A trader should deeply understand:

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1. Risk Management:

The most important aspect for a professional trader. Making a profit in trading is essential, but it is even more important to know how to minimize losses. This involves stop-loss, position sizing, and portfolio balancing.

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2. Trading Psychology:

Greed, fear, pride—understanding how these emotions affect trading decisions and how to control them is crucial.

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3. Technical Analysis:

Understanding market trends using chart patterns, support-resistance, RSI, MACD, moving averages, etc.

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4. Fundamental Analysis:

Evaluating the market based on a company, coin, or economic report. This is important for long-term trading or investment.

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