Other uses of the present tense
The present is also used:

◆ to tell facts considered unquestionable or universal truths.
Cinco más quince son veinte – Five plus fifteen is twenty

◆ to describe a past event, making it more vivid. This is called the historical present.
En 1969 el primer hombre llega a la luna – The first man gets to the moon in 1969

◆ to express hypothetical actions introduced by si.
Si llega el tren, salimos – If the train arrives, we leave

◆ to refer to possible consequences from an action that took place in the past with casi…
(almost) and por poco… (nearly).
Sacó la pistola y casi me mata – He drew the gun and nearly killed (kills) me

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