Balance potential gains against potential losses.
Most beginner investors get excited about the potential upside. They look at a chart going up and imagine how much money they could make. While that is natural, it is also dangerous. If you don't understand the danger first, you will likely get hurt when the market turns.
Once you have anchored downside risk, only then does it make sense to ask the other half of the equation: What could I gain—and why would that actually happen?
Now, here is the most important moment in your investing journey. You have already asked the hard questions: What could I lose? What could I gain? And why?