When do you use the preterite? and when do you use the imperfect?

we use the past tense when we describe actions carried out in the past tense, that is, events that have already happened and the imperfect tense we use it to describe actions that are part of the past but still continue being in the present.

Explanation:

In the Spanish language there are several verb tenses, in this case we are studying the past or past tense of verbs and the imperfect tense which also indicates past actions that follow in the present.

en la escuela tenemos momentos muy cheveres y momentos muy aburridos.