How to Invest in Stocks: Fundamental vs. Technical Analysis and How to Choose the Right Stocks

The stock market is one of the most powerful vehicles in history for the preservation and expansion of wealth. Owning a stock means, in essence, being the owner of a micro-fraction of a living company: an entity with employees, patents, cash flows, and the ability to produce goods or services that society demands daily.

However, when an investor decides to enter the stock market, they immediately find themselves facing a universe of thousands of available corporations. How do you discriminate between noise and true value? How do you know if a company is trading at a fair price or if it is overvalued?

To answer this, the global financial community is divided into two major schools of thought: Fundamental Analysis and Technical Analysis. Understanding the virtues of each method is the essential first step in learning how to choose the right stocks for an investment portfolio.

1. Fundamental Analysis: Study the Business Behind the Chart

Fundamental Analysis is based on a logical premise: the price of a stock in the short term can be affected by the fear or euphoria of the masses, but in the long term, the price will inevitably follow the financial reality of the company.

This methodology focuses on evaluating the economic health, competitiveness, and solidity of the company through reading its financial statements and competitive environment.

Key Metrics of Fundamental Analysis:

Revenue and Net Profit Margin: Allows you to verify if the company is selling more and more, and most importantly, if it is capable of turning those sales into real profits after paying all its operating costs.

• Debt-to-Equity Ratio: Evaluates whether the company is financing itself healthily or if it has incurred excessive debts that put its survival at risk during periods of recession or rising interest rates.

• The P/E Ratio (Price-to-Earnings): A metric that compares the current stock price with the earnings per share generated by the company. It helps determine, on a relative basis, whether a stock is “cheap” or “expensive” compared to its historical performance or its competitors in the same sector.

• Focus: It is the preferred tool of long-term investors (Value Investing style), who seek to acquire large companies with clear competitive advantages when the market, due to temporary panic, offers them at a discount price.

2. Technical Analysis: Study Market Behavior

Technical Analysis completely ignores earnings reports, debt, and company products. Its basic premise is that all relevant information about a company—both its public data and investors’ future expectations—is already reflected mathematically in the current price and trading volume.

This school focuses on studying candlestick charts and historical patterns to predict the most likely direction the price will take in the short and medium term, based on the collective psychology of participants.

Key Tools of Technical Analysis:

Trends and Structures: Visual identification of whether the market is in a phase of increasing highs and lows (uptrend) or decreasing highs and lows (downtrend).

• Support and Resistance: Psychological price zones where historically declines (floors) or rallies (ceilings) stop due to the accumulation of institutional buy or sell orders.

• Oscillators and Indicators (e.g., RSI or MACD): Mathematical formulas applied to price that help determine whether the pace of a rise has entered saturation territory (overbought) or whether a decline has reached a point of extreme exhaustion (oversold).

• Focus: It is the fundamental methodology for short and medium-term traders (Swing Trading or Day Trading), where the goal is not to own the company for years, but to capture the momentum of a price movement in days or weeks.

3. How to Choose the Right Stocks? The Selection Filter

To build a robust and professional portfolio, the most successful investors don’t choose sides; they use a hybrid strategy that combines the best of both worlds through a three-layer filtering process:

Layer 1: Quality Filter (Fundamental Analysis)

Before looking at a chart, select a universe of companies with understandable business models, that show sustained earnings growth over the past five years, that have management with an ethical track record, and that operate in sectors with tailwinds for the future (technology, healthcare, defensive consumption).

Layer 2: Momentum and Entry Filter (Technical Analysis)

Once the high-quality company is selected, resort to the chart to determine when is the optimal time to acquire it. Buying an excellent company just when its technical chart shows a vertical and parabolic overbought situation often results in painful temporary losses. The technical investor will patiently wait for the price to suffer a healthy correction towards long-term support or an important moving average before placing their capital.

Layer 3: The Diversification Filter

Even with the best combined analysis, the future is inherently unpredictable. Therefore, choosing the right stocks also means not concentrating more than 5% to 10% of the total portfolio capital in a single company. Distributing the selection among different economic sectors (for example, balancing the technology sector with the industrial or basic consumption sector) acts as a natural buffer against unexpected corporate events.

The confluence between a financially healthy company and a technically justified entry price is the optimal formula for operating in the stock market with rigor, risk control, and high probabilities of wealth success.