Use the present tense to describe a state or action occurring in the present time.
E.g. I am a student.
E.g. The are studying the Holy Roman Empire.
Use the present tense to describe habitual action.
E.g. They eat at Joe’s Diner every night.
E.g. My father never drinks coffee.
Use the present tense to describe things that ar always true.
E.g. Earth is round.
E.g. Grass is green.