This is how I understand the present simple:
Form – Subject + Form 1 of the verb
I do not (don’t) write.
Do you write?
I can use it to express habits and routines, likes and dislikes, universal truths and generalizations (facts), timetables and schedules.
Maxine gets up at 4 every morning.
I prefer tea over coffee.
The earth goes round the sun.
Exams start at eight.