Verbos: Pretérito vs Imperfecto

Señor Jordan vídeo

It seems simple enough, just like this video clip says. 

However, when I realized how many mistakes I was making, I decided to go to YouTube for help.

I love this video because it combines listening, reading, vocabulario and clarification on this grammar point.

Señor Jordan vídeo #2

And, even better, he has two videos to give us even more insights into when to use each words. My take away is that preterite is more concrete, more recognizable than. If I can't say that the action is definitely over with, it's probably imperfect. 

Anyway, that's going to be my strategy for now.