Introduction to Technical Analysis

Technical analysis rests on three foundational assumptions. First, markets discount everything: the current price already reflects all known information—earnings, news, sentiment, and macroeconomic conditions. Therefore, studying the price itself captures the net effect of all factors influencing the stock.

Second, prices move in trends. A stock in an uptrend is more likely to continue rising than to reverse, and vice versa. This doesn't mean trends last forever, but they persist long enough to generate trading opportunities. Identifying and following trends is at the heart of technical analysis.

Third, history tends to repeat itself. Because human psychology doesn't change—fear and greed drive buying and selling—price patterns that worked in the past tend to recur. Chart patterns like head-and-shoulders, double bottoms, and triangles appear repeatedly across different stocks and time periods.

The three most common chart types are line charts, bar charts, and candlestick charts. A line chart connects closing prices over time with a simple line. It's clean and easy to read, making it useful for identifying long-term trends, but it lacks detail about intraday price action.

A bar chart (OHLC chart) shows four data points for each period: open, high, low, and close. Each bar is a vertical line spanning the high-to-low range, with small horizontal ticks marking the open (left) and close (right). This provides much more information than a line chart.

A candlestick chart conveys the same OHLC information in a more visual format. The "body" of the candle represents the range between open and close, while "wicks" (or shadows) extend to the high and low. A filled or red candle means the close was below the open (bearish); a hollow or green candle means the close was above the open (bullish). Candlestick charts are the most popular choice among technical analysts due to their visual clarity.

A trend is the general direction of a stock's price. An uptrend is defined by a series of higher highs and higher lows. A downtrend shows lower highs and lower lows. A sideways trend (consolidation) occurs when the price moves within a horizontal range without making meaningful new highs or lows.

Trend lines are drawn by connecting two or more significant lows (in an uptrend) or highs (in a downtrend). A valid trend line should touch at least two points, and the more times price bounces off a trend line, the more significant it becomes. When a stock breaks through an established trend line, it often signals a potential trend reversal.

Trends exist on multiple timeframes simultaneously. A stock may be in a long-term (monthly) uptrend, a medium-term (weekly) consolidation, and a short-term (daily) downtrend. Understanding which timeframe you're trading helps you make sense of seemingly contradictory signals.

Support is a price level where buying pressure tends to overcome selling pressure, causing the price to bounce higher. Resistance is a level where selling pressure overcomes buying, causing the price to pull back. These levels form because traders remember previous price points and act on them.

Support and resistance levels become stronger each time they're tested. If a stock bounces off $50 three separate times, that level becomes a significant floor. When support or resistance is finally broken, the breakout is often powerful—and the old support level frequently becomes new resistance (and vice versa).

Identifying key support and resistance levels is one of the most practical skills in technical analysis. Even fundamental investors can benefit by timing purchases near support (where downside risk is defined) and being cautious near resistance (where upside may be limited short-term).

Volume—the number of shares traded in a given period—is the fuel that drives price movements. High volume on an up day confirms strong buyer interest. High volume on a down day confirms heavy selling pressure. Low volume moves are less trustworthy because they can be easily reversed.

The most useful volume analysis involves looking for divergences between price and volume. If a stock makes a new high but volume is declining, the uptrend may be running out of steam—fewer buyers are willing to push prices higher. Conversely, a price decline on falling volume suggests selling pressure is exhausting, potentially setting up a reversal.

Volume spikes often mark significant events: earnings releases, news announcements, or institutional buying/selling. A breakout above resistance accompanied by volume 2-3 times the average is far more likely to be sustained than one on thin volume. Always use volume as a confirmation tool for price signals.

Technical indicators are mathematical calculations based on price and volume data. Moving averages smooth out price data to reveal the underlying trend. The 50-day and 200-day simple moving averages are widely followed—when the 50-day crosses above the 200-day (a "golden cross"), it's considered bullish, and the opposite ("death cross") is bearish.

The Relative Strength Index (RSI) measures the speed and magnitude of price changes on a scale of 0-100. Readings above 70 suggest a stock may be overbought (potential pullback), while readings below 30 suggest oversold conditions (potential bounce). MACD (Moving Average Convergence Divergence) is another popular indicator that identifies trend changes through the interaction of two moving averages.

Bollinger Bands place bands two standard deviations above and below a 20-day moving average, creating a visual envelope that expands during volatile periods and contracts during calm ones. When the price touches the upper band, the stock may be extended to the upside; touching the lower band may signal a buying opportunity. No single indicator is reliable alone—use multiple indicators for confirmation.

The most successful investors often combine both approaches. Fundamental analysis tells you what to buy—companies with strong earnings, competitive advantages, and reasonable valuations. Technical analysis helps determine when to buy—identifying favorable entry points based on chart patterns and indicator signals.

For example, if your fundamental analysis identifies NVIDIA (NVDA) as undervalued, technical analysis can help you time the purchase. Waiting for the stock to pull back to a support level or its 50-day moving average gives you a better risk-reward entry than buying at all-time highs.

Similarly, technical analysis can help with selling decisions. If a stock you own rallies to a major resistance level and shows bearish indicator divergences, trimming the position and locking in profits makes sense even if the fundamentals remain strong. The goal is to use each discipline where it adds the most value.