Here is the real pro-tip that changes everything. You can eat them from the can, but you should always drain and rinse them first. That goopy liquid is not poison, but it is basically bean-flavored salty water.
can you eat black beans straight from the can? - Test Food Kitchen
Rinsing them under cold water for ten seconds does two things. First, it washes away a ton of sodium—which your heart will thank you for. Second, it gets rid of that metallic, canned taste.
Try this: eat one bean straight from the can liquid, then rinse one and eat it. The rinsed bean tastes cleaner and fresher. It’s like the difference between a fresh tomato and a canned one—both are good, but fresh wins.
