Question

past continuous vs past simple

Answer 1

Past continous:v i was studing in my house
past simple: i studied in my house

Answer 2

past simple is just to say that something started and finished at once and for example 
"I finished my homework very late last night"

and past continuous is to say that you were doing something and got interrupted for example 

i was doing my homework when i heard the crash

el pasado simple es para expresar que algo paso y se acabo en ese momento.

el pasado pretérito es para expresar  que   algo  que hacíamos fue interrumpido