We use Present Simple when we want to tell about something we do on a regular basis. We can describe habbits, every day events, scheduled events and so on. Also we can use this construction to discribe what we usually don't do.
Examples:
I play computer every day.
He goes to visit his grandmother every summer.
I don't play football after school.
Also Present Simple can be used to describe facts about something or someone, for example:
Masha likes apple juice.
Kiev is the capital of Ukraine.