Support and resistance levels are two very commonly used concepts in technical analysis, helping us determine where the price might "stagnate" or "turn around."

**Simple Explanation:**
- Support: Imagine it as the "floor" when the price drops. When the coin price reaches this level, buying pressure often increases, and the price may stop falling and bounce back.
- Resistance: Like the "ceiling" overhead. When the price rises to this level, selling pressure strengthens, and the coin price is likely to be suppressed or pull back.

**How to identify support and resistance levels? Here are some tips:**
1. Look at historical candlestick charts: Find lows where the price has tested multiple times but not broken below—that's support; find highs where the price has tested multiple times but not broken above—that's resistance.
2. Line connection method: Connect two or more obvious lows to draw a "support line"; connect obvious highs to draw a "resistance line."
3. Dynamic adjustment: As the market fluctuates, support and resistance lines will continuously change. The support/resistance line indicator in Gate App can automatically generate up to 5 lines to help you identify key zones.
4. Distance judgment: The closer the support/resistance is to the current price, the more significant its effect. But whether a key level is effective also depends on volume, candlestick patterns, and other multidimensional analysis.

**Practical Example (Simplified):**
- You are long BTC at 90,000 USDT. The system indicates recent support at 83,500 and resistance at 97,500. You can set stop-loss below support and take-profit above resistance.
- Breaking support means you should be especially cautious; consider reducing positions or exiting in the short term.
- Breaking resistance opens up more upside potential.

**Risk Reminder:**
- Support and resistance levels are just auxiliary tools and not "guaranteed"; they can be quickly broken during extreme volatility.
- It’s best to combine them with other technical indicators (like RSI, MACD) and overall market conditions for better judgment.

If you want to use the support/resistance line indicator in the app, try enabling the support/resistance line feature on the candlestick chart. The system will help mark them for you, which is great for beginners to get started quickly. By the way, are you mainly interested in learning technical analysis, or are you also concerned about the fundamental logic behind it?