The Present Simple tense is used to express actions that happen regularly or habitually. These actions can be in the past, present and future as there is no fixed time.
I play basketball. I eat healthy food.
It can be used to express facts and opinions
The earth is the shape of a globe. The sun is hot. We are humans.
The Present Simple can also be used to talk about future events / scheduled events when used with expressions of time.
The train arrives at 8pm today. I take my exam in an hour.
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