The present tense is the verb form used for things happening now, for habits, and for states that are true these days.
I feel sad. Feeling sad right now.
He gets up late on weekends. That's a habit, not one morning.
She lives in Berlin. Nothing is happening this second, yet the sentence is present tense because it describes a state that is true these days. So the present tense is not only for actions you can watch unfold. It also covers facts about where someone lives, what they own, or how they feel right now.
The train leaves at six. That is a future plan, said in the present tense.
One small caution: present does not always mean right now. The present tense can stretch beyond the current moment, so a sentence like She lives in Seoul describes an ongoing state, not something happening this second.
Stories do the reverse, putting past events into the present: So she walks in and says... This keeps the reader inside the moment, even though it happened long ago.