Hi everybody!
Yesterday in my live lesson with @TomLoranger, he asked me about the use and difference between the pretérito imperfecto and pretérito indefinido. So I decided to write this post explaining these verb tenses and share it with you all!
Maybe you can share some more examples and your corrections are welcome as well 
The pretérito imperfecto yo jugaba o yo comía translates to english imperfect I was playing or I was eating. The pretérito indefinido yo jugué o yo comí translates to the english simple past I played or I ate but it also can be translate as the english present perfect I have played or the emphatic past I did play.
The pretérito indefinido indicates:
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Events or actions that began and ended in the past, regardless of whether they occurred once or several times. Example: Visité varias ciudades de México.
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A single event. Example: Visité México.
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An event that occurred interrupting another action. Example: Estaba comiendo tortilla, cuando me caí.
The pretérito imperfecto indicates:
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Habitual actions that keeps repeating in time. Example: Visitaba mucho el Museo del Prado.
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An ongoing action, not completed. Example: Visitaba el Museo del Prado.
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A description of what was happening when there was an interruption. Example: Comía tortilla cuando me atraganté.
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General descriptions of people, landscapes, etc. in the past. Example: El paisaje era verde y había muchos pájaros.
I hope I explained it properly, if you have doubts or corrections let me know!
Adiós!