Present Simple, Present Continuous, Present Perfect,

Present Simple: To talk in general or about repetitive actions.
ex: I drink soda.
I drink soda everyday

Present Continuous: NOW!
ex: I am creating these exercises.

Present Perfect: Talking about the past up to the present.
ex: The plane has landed.(It´s on the ground now)

Past simple: To talk about the past
ex: I packed my bags yesterday.