There are a few techniques or investment methodologies I would like you to learn about:
Fundamental Approach: Think Warren Buffet: Assess the value of the company by looking at their growth, profit margin, Price to earnings ratio and other fundamental figures to determine if the company is undervalued and worth investing in. To some extend growth potential can be included in this.
Technical Approach: Looking at charts to find known patterns to decide when to enter and exit the trade. Resistance and support levels
Event Based Approach: Earnings call, FDA approval, an announcement about a merger or new product or a buyout.