I'm relatively new to poker so I'm not at any deep mathematical level yet, but what has helped me tremendously has been learning the basic pot odds
vs. drawing odds calculations. Before I learned this I was basically flying blind, just calling any bet to chase draws based on gut feelings, then come to find out I've been making -EV calls on the vast majority of hands like calling 2.5:1 pot odds
to chase a 10:1 draw.
We're faced with these types of decisions so often that this process should be second nature.