In the vibrant world of trading, day trading is a popular choice. It involves buying and selling financial instruments throughout the course of a single day.

The appeal of day trading lies in the potential to gain substantial returns in a short time. Nonetheless, it's vital to understand that this form of trading comes with its own set of risks.

Efficient day trading requires a thorough understanding of the stock market. It's vital to keep up with market news, understanding how various events may impact the value of assets you’re investing in.

Additionally, successful day traders embrace risk day trading management. This involves placing stop loss orders to curb potential losses and just investing money that you can afford to lose.

A crucial aspect of day trading is the capability to act swiftly. The markets can change quickly, and being able to make informed decisions on the fly can result in successful trades.

One of the most helpful day trading techniques is called ‘scalping’. This involves placing multiple trades within a short time period, hoping to make money from small price fluctuations.

Moreover, ‘momentum trading’ is another popular technique. This strategy involves purchasing stocks that are rising quickly and selling them before the trend reverses.

Day trading is not for the faint-hearted. It requires a high degree of investment knowledge, quick-thinking abilities, and a tolerance for risk. However, with the right knowledge, technique, and discipline, you can earn substantial profits through day trading.

In conclusion, day trading, or ‘trading the day’, is a high-energy trading method. It requires in-depth market knowledge, fast-thinking skills, and the capacity to handle risk effectively. With the appropriate approach and continual learning, you stand a chance to make profitable trades and increase your investment portfolio.